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did before irrigate the parts, is drawn down to the spermatical vessels, it leaveth the body more hot than it was; whence cometh the dilatation of the pipes: for we see plainly all effects of heat do ihen come on; as pilosity, more roughness of the skin, hardness of the flesh, &c.

181. The industry of the musician hath produced two other means of straining or intension of strings, besides their winding up. The one is the stopping of the string with the finger; as in the necks of lutes, viols, &c. The other is the shortness of the string, as in harps, virginals, &c. Both these have one and the same reason; for they cause the string to give a quicker start.

182. In the straining of a string, the farther it is strained, the less superstraining goeth to a note; for it reqnireth good winding of a string before it will make any note at all; and in the stops of lutes, &c. the higher they go, the less distance is between the frets.

183. If you fill a drinking glass with water, especially one sharp below, and wide above, and fillip upon the brim or outside; and after empty part of the water, and so more and more, and still try the tone by filliping; you shall find the tone fall and be more base, as the glass is more empty.

Experiments in consort touching the proportion of treble and base tones.

The just and measured proportion of the air percussed, towards the baseness or trebleness of tones, is one of the greatest secrets in the contemplation of sounds. For it discovered! the true coincidence of tones into diapasons; which is the return of the same sound. And so of the concords and discords L-tween the unison and the diapason, which we have touched before in the experiments of music; hut think fit to resume it here as a principal part of our inquiry touching the nature of sounds. It may be found out in the proportion of the winding of strings; in the proportion of the distance of frets; and in proportion of the concave of pipes, &c. but most commodiou8ly in the last of these.

134. Try therefore the winding of a string once abont, as soon as it is brought to that extension as will give a tone; and then of twice about, and thrice about, &c. and mark the scale or difference of the rise of the tone: whereby you shall discover, in one, twoefFects: both the proportion of the sound towards the dimension of the winding; and the proportion likewise of the sound towards the string, as it is more or less strained. But note that to -measure 'bis, the way will be, to take the length in a right line of the string, upon any winding about of the peg.

185. As for the stops, you are to take the number of frets; and principally the length of the line, from the first stop of the string, unto such a stop as shall produce a diapason to the former stop upon the same string.

186. But it will best, as it is said, appear in the bores of wind-instruments: and therefore cause some half dozen pipes to be made, in length and all things else alike, with a single, double, and so on

to a sextuple bore; and so mark what fall of tone every one giveth. But still in these three last instances, you must diligently observe, what length of string, or distance of stop, or concave of air, maketli what rise of sound. As in the last of these, which, as we said, is that which giveth the aptest demonstration, you must set down what increase of concave goeth to the making of a note higher; and what of two notes; and what of three notes; and so up to the diapason: for then the great secret of numbers and proportions will appear. It is not unlike that those that make recorders, &c. know this already: for that they make them in sets; and likewise bell-founders, in fitting the tune of their bells. So that inquiry may save trial. Surely it hath been observed by one of the ancients, that an empty barrel knocked upon with the finger, giveth a diapason to the sound of the like barrel full; but how that should be I do not well understand; for that the knocking of a barrel full or empty, doth scarce give any tone.

187. There is required some sensible difference in the proportion of creating a note, towards the sound itself, which is the passive: and that it be not too near, but at a distance. For in a recorder, the three uppermost holes yield one tone; which is a note lower than the tone of the first three. And the like, no doubt, is required in the winding or stopping of strings.

Experiments in consort touching exterior and interior sounds.

There is another difference of sounds, which we will call exterior and interior. It is not soft nor loud: nor it is not base nor treble: nor it is not musical nor immusical: though it be true, that there can be no tone in an interior sound; but on the other side, in an exterior sound there may be both musical and immusical. We shall therefore enumerate them, rather than precisely distinguish them; though, to make some adumbration of that we mean, the interior is rather an impulsion or contusion of the air, than an elision or section of the same: so as the percussion of the one towards the other differeth as a blow differeth from a cut.

188. In speech of man, the whispering, which they call susurrus in Latin, whether it be louder or softer, is an interior sound; but the speaking out is an exterior sound; and therefore you can never make a tone, nor sing in whispering; but in speech yon may: so breathing, or blowing by the mouth, bellows, or wind, though loud, is an interior sound; but the blowing through a pipe or concave, though soft, is an exterior. So likewise the greatest winds, if they have no coarctation, or blow not hollow, give an interior sound; the whistling or hollow wind yieldeth a singing, or exterior sound; the former being pent by some other body; the latter being pent in by its own density: and therefore we see, that when the wind bloweth hollow, it is a sign of rain. The flame, as it moveth within itself or is blown by a bellows, giveth a murmur or interior sound.

189. There is no hard body, but struck against another hard body will yield an exterior sound greater or lesser: insomuch as if the percussion be over-soft, it may induce a nullity of sound; but never an interior sound; as when one treadeth so softly that he is not heard.

190. Where the air is the percutient, pent or not pent, against a hard body, it never giveth an exterior sound; as if you blow strongly with a bellows against a wall.

191. Sounds, both exterior and interior, may be made as well by suction as by emission of the breath: as in whistling or breathing.

Experiments in consort, touching articulation of sounds.

192. It is evident, and it is one of the strangest secrets in sounds, that the whole sound is not in the whole air only; but the whole sound is also in every small part of the air. So that all the curious diversity of articulate sounds, of the voice of man or birds, will enter at a small cranny inconfused.

193. The unequal agitation of the winds and the like, though they be material to the carriage of the sounds farther or less way; yet they do not confound the articulation of them at all, within that distance that they can be heard; though, it may be, they make them to be heard less way than in a still; as hath been partly touched.

194. Over-great distance confoundeth the articulation of sounds; as we see, that you may hear the sound of a preacher's voice, or the like, when you cannot distinguish what he saith. And one articulate sound will confound another, as when many speak at once.

195. In the experiment of speaking under water, when the voice is reduced to such an extreme exility, yet the articulate sounds, which are the words, arc not confounded as hath been said.

196. I conceive, that an extreme small or an extreme great sound cannot be articulate; but that the articulation requircth a mediocrity of sound: for that the extreme small sound confoundeth the articulation by contracting; and the great sound by dispersing: and although, as was formerly said, a sound articulate, already created, will be contracted into a small cranny; yet the first articulation requireth more dimension.

197. It hath been observed, that in a room, or in a chapel, vaulted below and vaulted likewise in the roof, a preacher cannot be heard so well, as in the like places, not so vaulted. The cause is, for that the subsequent words come on before the precedent words vanish; and therefore the articulate sounds

are more confused, though the gross of the sound be greater.

198. The motions of the tongue, lips, throat, palate, &c. which go to the making of the several alphabetical letters, are worthy inquiry, and pertinent to the present inquisition of sounds: but because they are subtle, and long to describe, we will refer them over, and place them amongst the experiments of speech. The Hebrews have been diligent in it, and have assigned which letters are labial, which dental, which guttural, &c. As for the Latins and Grecians, they have distinguished between semivowels and mutes; and in mutes between muta? tenues, media?, and aspirate?; not amiss, but yet not diligently enough. For the special strokes and motions that create those sounds, they have little inquired: as, that the letters B, P, F, M, are not expressed, but with the contracting or shutting of the mouth; that the letters N and B, cannot be pronounced but that the letter N will turn into M; as hecatonba will be hecatomba. That M and T cannot be pronounced together, but P will come between; as emtus is pronounced emptus; and a number of the like. So that if you inquire to the full, you will find, that to the making of the whole alphabet there will be fewer simple motions required than there are letters.

199. The lungs are the most spungy part of the body; and therefore ablest to contract and dilate itself: and where it contracteth itself.it expelleth the air; which through the artery, throat, and mouth, maketh the voice: but yet articulation is not made but with the help of the tongue, palate, and the rest of those they call instruments of voice.

200. There is found a similitude between the sound that is made by inanimate bodies, or by animate bodies, that have no voice articulate, and divers letters of articulate voices; and commonly men have given such names to those sounds, as do allude unto the articulate letters; as trembling of water hath resemblance with the letter L; quenching of hot metals with the letter Z; snarling of dogs with the letter R; the noise of screech-owls with the letter Sh; voice of cats with the diphthong Eu;

"voice of cuckows with the diphthong Ou; sounds of strings with the letter Ng; so that if a man, for curiosity or strangeness' sake, would make a puppet or other dead body to pronounce a word, let him consider, on the one part, the motion of the instruments of voice; and on the other part, the like sounds made in inanimate bodies; and what conformity there is that causeth the similitude of sounds; and by that he may minister light to that effect.

CENTURY III.

Experiments in consort touching the motions of sound*, in what lines they are circular, oblique, straight, upwards, downwards, forwards, backirards.

201. All sounds whatsoever move round; that is to say, on all sides; upwards, downwards, forwards, and backwards. This appeareth in all instances.

202. Sounds do not require to be conveyed to the sense in a right line, as visibles do, but may be arched; though it be true, they move strongest in a right line; which nevertheless is not caused by the Tightness of the line, but by the shortness of the distance; linea recta brevissima. And therefore we see if a wall be between, and you speak on the one side, you hear it on the other; which is not because the sound passeth through the wall, but archeth over the wall.

203. If the Bound be stopped and repercussed, it cometh about on the other side in an oblique line. S«, if in a coach one side of the boot be down, and the other up, and a beggar beg on the close side; you will think that he were on the open side. So likewise, if a bell or clock be, for example, on the north side of a chamber, and the window of that chamber be upon the south; he that is in the chamber will think the sound came from the south.

204. Sounds, though they spread round, so that there is an orb or spherical area of the sound, yet they move strongest, and go farthest in the fore-lines, from the first local impulsion of the air. And therefore in preaching, you shall hear the preacher's voice better before the pulpit than behind it, or on the sides, though it stand open. So a harquebuss, or ordnance, will be farther heard forwards from the mouth of the piece, than backwards, or on the sides.

205. It may be doubted, that sounds do move better downwards than upwards. Pulpits are placed high above the people. And when the ancient generals spake to their armies, they had ever a mount of turf cast up, whereupon they stood;'but this may be imputed to the stops and obstacles which the voice meeteth with, when one speaketh upon the level. But there seemeth to be more in it; for it may be that spiritual species, both of things visible and sounds, do move better downwards than upwards. It is a strange thing, that to men standing below on the ground, those that be on the top of Paul's seem much less than they are, and cannot be known ; but to men above, those below seem nothing so much lessened, and may be known : yet it is true, that all things to them above seem also somewhat contracted, and better collected into figure: as knots in gardens show best from an upper window or terras.

206. But to make an exact trial of it, let a man stand in a chamber not much above the ground, and speak out at the window, through a trunk, to one standing on the ground, as softly as he can, the other

laying his ear close to the trunk: then via versa, let the other speak below, keeping the same proportion of softness; and let him in the chamber lay his ear to the trunk: and this may be the aptest means to make a judgment, whether sounds descend or ascend better.

Experiments in consort tottching the lasting and perishing of sounds; and touching the time they require to their generation or delation.

207. After that sound is created, which is in a moment, we find it continueth some small time, melting by little and little. In this there is a wonderful error amongst men, who take this to be a continuance of the first sound ; whereas, in truth, it is a renovation, and not a continuance; for the body percussed hath, by reason of the percussion, a trepidation wrought in the minute parts, and so reneweth the percussion of the air. This appeareth manifestly, because that the melting sound of a bell, or of a string stnicken, which is thought to be a continuance, ceaseth as soon as the bell or string are touched. As in a virginal, as soon as ever the jack falleth, and toucheth the string, the sound ceaseth; and in a bell, after you have chimed upon it, if you touch the bell, the sound ceaseth. And in this you must distinguish that there are two trepidations: the one manifest and local; as of the bell when it is pensile : the other secret, of the minute parts; such as is described in the ninth instance. But it is true, that the local helpeth the secret greatly. We see likewise that in pipes, and other wind-instruments, the sound lasteth no longer than the breath bloweth. It is true, that in organs there is a confused murmur for a while after you have played; but that is but while the bellows are in falling.

208. It is certain, that in the noise of great ordnance, where many are shot off together, the sound will be carried, at the least, twenty miles upon the land, and much farther upon the water. But then it will come to the ear, not in the instant of the shooting off, but it will come an hour or more later. This must needs be a continuance of the first sound; for there is no trepidation which should renew it. And the touching of the ordnance would not extinguish the sound the sooner: so that in great sounds the continuance is more than momentary.

209. To try exactly the time wherein sound is delated, let a man stand in a steeple, and have with him a taper; and let some vail be put before the taper; and let another man stand in the field a mile off. Then let him in the steeple strike the bell; and in the same instant withdraw the vail; and so let him in the field tell by his pulse what distance of time there is between the light seen, and the sound heard: for it is certain that the delation of light is in instant. This may be tried in far greater distances, allowing greater lights and sounds.

210. It is generally known and observed that light, and the object of sight, move swifter than sound: for we see the flash of a piece is seen sooner than the noise is heard. And in hewing wood, if one be some distance off, he shall see the arm lifted up for a second stroke, before he hear the noise of the first. And the greater the distance, the greater is the prevention: as we see in thunder which is far off, where the lightning precedeth the crack a good space.

211. Colours, when they represent themselves to the eye, fade not, nor melt not by degrees, but appear still.in the same strength ; but sounds melt and vanish by little and little. The cause is, for that colours participate nothing with the motion of the air, but sounds do. And it is a plain argument, that sound participated of some local motion of the air, as a cause sine qua non, in that it perisheth so suddenly; for in every section or impulsion of the air, the air doth suddenly restore and reunite itself; which the water also doth, but nothing so swiftly.

Experiments in consort touching the passage and interceptions of sounds.

In the trials of the passage, or not passage of sounds, you must take heed you mistake not the passing by the sides of the body, for the passing through a body; and therefore you must make the intercepting body very close; for sound will pass through a small chink.

212. Where sound passeth through ahardorclose body, as through water; through a wall; through metal, as in hawks' bells stopped, &c.; the hard or close body must be but thin and small; for else it deadeth and extinguished) the sound utterly. And therefore in the experiment of speaking in air under water, the voice must not be very deep within the water; for then the sound pierceth not. So if you speak on the farther side of a close wall, if the wall be very thick you shall not be heard; and if there were a hogshead empty, whereof the sides were some two foot thick, and the bung-hole stopped; I conceive the resounding sound, by the communication of the outward air with the air within, would be little or none: but only you shall hear the noise of the outward knock, as if the vessel were full.

213. It is certain, that in the passage of sounds through hard bodies the spirit or pneumatical part of the hard body itself doth co-operate j but much better when the sides of that hard body are struck, than when the percussion is only within, without touch of the sides. Take therefore a hawk's bell, the holes stopped up, and hang it by a thread within a bottle glass, and stop the mouth of the glass very close with wax; and then shake the glass, and see whether the bell give any sound at all, or how weak: but note, that you must instead of the thread take a wire; or else let the glass have a great belly; lest when you shake the bell, it dash upon the sides of the glass.

214. It is plain, that a very long and downright arch for the sound to pass, will extinguish the sound quite; so that that sound, which would be heard over a wall, will not be heard over a church; nor that sound, which will be heard if you stand some

distance from the wall, will be heard if you stand close under the wall.

215. Soft and foraminous bodies, in the first creation of the sound, will dead it; for the striking against cloth or fur will make little sound; as hath been said: but in the passage of the sound, they will admit it better than harder bodies; as we see that curtains and hangings will not stay the sound much; but glass windows, if they be very close, will check a sound more than the like thickness of cloth. We see also in the rumbling of the belly, how easily the sound passeth through the guts and skin.

216. It is worthy the inquiry, whether great sounds, as of ordnance or bells, become not more weak and exile when they pass through small crannies. For the subtilties of articulate sounds, it may be, may pass through small crannies not confused; but the magnitude of the sound, perhaps, not so well.

Experiments in consort touching the medium of sounds.

217. The mediums of sounds are air; soft and porous bodies; also water. And hard bodies refuse not altogether to be mediums of sounds. But all of them are dull and unapt deferents, except the air.

218. In air, the thinner or drier air carrieth not the sound so well as the more dense; as appeareth in night sounds, and evening sounds, and sounds in moist weather and southern winds. The reason is already mentioned in the title of majoration of sounds; being for that thin air is better pierced; but thick air preserveth the sound better from waste: let further trial be made by hollowing in mists and gentle showers; for, it may be, that will somewhat dead the sound.

219. How far forth flame may be a medium of sounds, especially of such sounds as are created by air, and not betwixt hard bodies, let it be tried in speaking where a bonfire is between; but then you must allow for some disturbance the noise that the flame itself maketh.

220. Whether any other liquors, being made mediums, cause a diversity of sound from water, it may be tried: as by the knapping of the tongs; or striking of the bottom of a vessel, filled either with milk or with oil; which though they be more light, yet are they more unequal bodies than air.

Of the nature of the mediums we have now spoken; as for the disposition of the said mediums, it doth consist in the penning, or not penning of the air; of which we have spoken before in the title of delation of sounds: it consisteth also in the figure of the concave through which it passeth; of which we will speak next.

Experiments in consort, what the figures of the pipes, or concaves, or the bodies deferent, conduce to the sounds.

How the figures of pipes, or concaves, through which sounds pass, or of other bodies deferent, conduce to the variety and alteration of the sounds; either in respect of the greater quantity, or less quantity of air, which the concaves receive; or in respect of the carrying of sounds longer and shorter way; or in respect of many other circumstances; they have been touched, as falling into other titles. But those figures which we now are to speak of, we intend to be, as they concern the lines through which the sound passeth; as straight, crooked, angular, circular, &c.

221. The figure of a bell partaketh of the pyramis, but yet coming off and dilating more suddenly. The figure of a hunter's horn and cornet is oblique; yet they have likewise straight horns; which if they be of the same bore with the oblique, differ little in sound, save that the straight require somewhat a stronger blast. The figures of recorders, and flutes, and pij.es, are straight; but the recorder hath a less bore and a greater, above and below. The trumpet hath the figure of the letter S: which maketh that purling sound, &c. Generally the straight line hath the cleanest and roundest sound, and the crooked, the more hoarse and jarring.

222. Of a sinuous pipe that may have some four ■ flexions, trial would be made. Likewise of a pipe

made like a cross, open in the midst. And so likewise of an angular pipe: and see what will be the effects of these several sounds. And so again of a circular pipe; as if you take a pipe perfect round, and make a hole whereinto you shall blow, and another hole not far from that; but with a traverse or stop between them; so that your breath may go the round of the circle, and come forth at the second hole. You may try likewise percussions of solid bodies of several figures; as globes, flats, cubes, crosses, triangles, &c. and their combinations, as flat against flat, and convex against convex, and convex against flat, &c. and mark well the diversities of the sounds. Try also the difference in sound of several crassitudes of hard bodies percussed; and take knowledge of the diversities of the sounds. I myself have tried, that a bell of gold yieldeth an excellent sound not inferior to that of silver or brass, but rather better; yet we see that a piece of money of gold soundeth far more flat than a piece of money of silver.

223. The harp hath the concave not along the strings, but across the strings: and no instrument hath the sound so melting and prolonged, as the Irish harp. So as I suppose, that if a virginal were made with a double concave, the one all the length, as the virginal hath; the other at the end of the strings, as the harp hath; it must needs make the sound perfecter, and not so shallow and jarring. You may try it without any sound-board along, but only harp-wise at one end of the strings; or lastly, with a doable concave at each end of the strings one.

Erperiment» in consort touching the mixture of sounds.

224. There is an apparent diversity between the species visible and audible in this,- that the visible doth not mingle in the medium, but the audible doth. For if we look abroad, we see heaven, a number of stars, trees, hills, men, beasts, at once. And the species of the one doth not confound the other. But if so many sounds came from several

parts, one of them would utterly confound the other. So we see, that voices or consorts of music do make a harmony by mixture, which colours do not. It is true nevertheless that a great light drowneth a smaller, that it cannot be seen; as the sun that of a glow-worm; as well as a great sound drowneth a lesser. And I suppose likewise, that if there were two lanthorns of glass, the one a crimson, and the other an azure, and a candle within either of them, those coloured lights would mingle, and cast upon a white paper a purple colour. And even in colours, they yield a faint and weak mixture : for white walls make rooms more lightsome than black, &c. but the cause of the confusion in sounds, and the inconfusion in species visible, is, for that the sight worketh in right lines, and maketh several cones; and so there can be no coincidence in the eye or visual point: but sounds, that move in oblique and arcuate lines, must needs encounter and disturb the one the other.

225. The sweetest and' best harmony is, when every part or instrument is not heard by itself, but a conflation of them all; which requireth to stand some distance off, even as it is in the mixture of perfumes; or the taking of the smells of several flowers in the air.

226. The disposition of the air in other qualities, except it be joined with sound, hath no great operation upon sounds: for whether the air be lightsome or daTk, hot or cold, quiet or stirring, except it be with noise, sweet-smelling, or stinking, or the like; it importeth not much; some petty alteration or difference it may make.

227. But sounds do disturb and alter the one the other: sometimes the one drowning the other, and making it not heard; sometimes the one jBrring and discording with the other, and making a confusion; sometimes the one mingling and compounding with the other, and making a harmony.

228. Two voices of like loudness will not bo heard twice as far as one of them alone; and two candles of like light will not make things seen twice as far off as one. The cause is profound; but it scemeth that the impressions from the objects of the senses do mingle respectively, every one with his kind; but not in proportion, as is before demonstrated: and the reason may be, because the first impression, which is from privative to active, as from silence to noise, or from darkness to light, is a greater degree than from less noise to more noise, or from less light to more light. And the reason of that again may be, for that the air, after it hath received a charge, doth not receive a surcharge, or greater charge, with like appetite as it doth the first charge. As for the increase of virtue generally, what proportion it beareth to the increase of the matter, it is a large field, and to be handled by itself.

Experiments in consort touching melioration of sounds.

229. All reflexions concurrent do make sounds greater; but if the body thatcreateth either the original sound, or the reflexion, be clean and smooth, it maketh them sweeter. Trial may be made of a

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