Philosophical Transactions of the Royal Society of London, Volume 96

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W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1806 - Mathematics
 

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Page 18 - In short, whether we are considering the sources of extended exertion or of accumulated energy, whether we compare the accumulated forces themselves by their gradual or by their sudden effects, the idea of mechanic force in practice is always the same, and is proportional to the space through which any moving force is exerted or overcome, or to the square of the velocity of a body in which such force is accumulated.
Page 463 - Memoirs comprising the navigation to and from China, by the China Sea and through the various Straits and Channels in the Indian Archipelago; also the navigation of Bombay Harbour. London, 1805.
Page 358 - ... and passes down in the form of a fold parallel to the great ridge, till it enters the orifice of the second, where it takes another direction. It is continued along the upper edge of that cavity, and terminates within the orifice of a small bag, which may be termed the third cavity. " This band on one side, and the great ridge on the other, form a canal which leads from the oesophagus down to the cellular structure in the lower part of the first cavity. " The orifice of the second cavity, when...
Page 292 - Every gardener knows that early varieties of the potato never afford either blossom or seeds ; and I attributed this peculiarity to privation of nutriment, owing to the tubers being formed preternaturally early, and thence drawing off that portion of the true sap which, in the ordinary course of nature, is employed in the formation and nutrition of blossoms and seeds. I therefore planted, in the last spring, some cuttings of a very early variety of the...
Page 190 - ... of an inch in breadth, extended from the middle line of the tumour to the bulb of the urethra, where it insensibly disappeared. The usual rounded projection of the caput gallinaginis was not visible : it had wasted away, and the remains were concealed in the fold forming this bridle, which at that part was not thicker than at any other.
Page 98 - ... from the facts that few of their branches rise perpendicularly upwards, and that their roots always spread horizontally ; but this objection I think may be readily answered. The luxuriant shoots of trees, which abound in sap, in whatever direction they are first protruded, almost uniformly turn upwards, and endeavour to acquire a perpendicular direction ; and to this their points will immediately return, if they are bent downwards during any period of their growth ; their curvature upwards being...
Page 292 - I conceived that if their leaves and stems contained any unemployed true sap, it could not readily find its way to the tuberous roots, its passage being obstructed by the rupture of the vessels, and by gravitation; and I had soon the pleasure to see that instead of returning down the principal stem into the ground, it remained and formed small tubers at the base of the leaves of the depending branches. The preceding facts are, I think, sufficient to prove that the fluid, from which the tuberous root...
Page 294 - I have in my possession a piece of a fir-tree, from which a portion of bark, extending round its whole stem, had been taken off several years before the tree was felled ; and of this portion of wood one part grew above, and the other below the decorticated space. Conceiving that, according to the theory I am endeavouring to support, the wood above the decorticated space ought to be much heavier than that below it, owing to the stagnation of the descending sap, I ascertained the specific gravity of...
Page 359 - ... that cavity are full, the rest runs off into the cellular structure of the first cavity immediately below, and afterwards into the general cavity. It would appear that camels when accustomed to go journeys, in which they are kept for an unusual number of days without water, acquire the power of dilating the cells so as to make them contain a more than ordinary quantity as a supply for their journey ; at least, such is the account given by those who have been in Egypt.
Page 293 - ... water which their leaves absorb, when immersed in that fluid, will be carried downwards by the alburnum, and conveyed into a portion of bark below the decorticated space; and that the insulated bark will be preserved alive and moist during several days ; * and if the moisture absorbed by a leaf can be thus transferred, it appears extremely probable that the true sap will pass through the same channel. This power in the alburnum to carry fluids in different directions probably answers very important...

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