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THE SIR JOHN CASS TECHNICAL

NORTHERN POLYTECHNIC
INSTITUTE,

INSTITUTE,
JEWRY STREET, ALDGATE, E.C.

HOLLOWAY, LONDON, N.
Principal

CHARLES A. Kohn, M.Sc., Ph.D., F.I.C. (Close to Holloway Stn., G.N.R., and Highbury Stn., N.L.R.) EVENING CLASSES in CHEMISTRY, METALLURGY, LONDON UNIVERSITY SCIENCE AND ENGINEERING PHYSICS and MATHEMATICS designed to meet the requirements of

DEGREES. those engaged in CHEMICAL, METALLURGICAL and ELECTRICAL

Day and Evening Courses in the above under recognised teachers inINDUSTRIES and in trades associated therewith. Also preparation for the B.Sc. Examination of London Uni.

MATHEMATICS, versity.

PHYSICS,
Chemistry
I CHARLES A. KOHN, M.Sc., Ph.D., F.I.C.,

CHÉMISTRY,
I and H. BURROWS, A.R.C.S., Ph.D., F.I.C.
Physics

ENGINEERING.
R. S. Willows, D.Sc., M.A.
Metallurgy
C. 0. BANNISTER, Assoc. R.S.M.

Separate Laboratories for Elementary, Advanced and Honours students, Mathematics G. M. K. LEGGETT, B.A.

exceptionally large and well equipped. Every facility for special and advanced practical work in well-equipped laboratories both in the afternoon and evening.

RESEARCH. NEW SESSION began MONDAY, SEPTEMBER 26.

Accommodation and apparatus provided for research in either Pure or The Institute is readily accessible and near to Fenchurch Street, Liver. Applied Chemistry and Physics, and Engineering, in rooms specially pool Street, Broad Street and Metropolitan Railway Stations.

adapted for this purpose, For details of the Classes apply at the Office of the Institute, or by Full particulars at the Institute or sent on receipt of postcard. letter to the PRINCIPAL.

REG. S. CLAY, D.Sc., Principal. W. H. DAVISON, M.A., Clerk to the Governing Body. At the SOUTH-WESTERN POLYTECHNIC,

BEDFORD COLLEGE FOR WOMEN. Manresa Road, Chelsea, S.W., Day College Courses of thirty hours

(UNIVERSITY OF LONDON.) per week will le conducted in preparation for the London University Degrees of B.Sc. in Mechanical and Electrical Engineering, in Chemis.

YORK PLACE, BAKER STREET, W. try, Physics and the Natural Sciences. The composition fee for the The HALF TERM begins on MONDAY, NOVEMBER 14. Session of three terms, 1904-1905, is £15. These Courses are recog; The College provides instruction for Students preparing for the Uninised for “ Internal Students of the University, and consist of

versity of London Degrees in Arts, Science, and Preliminary Medicine, lecture and laboratory instruction. The Courses are conducted by :- also instruction in subjects of General Education. MECHANICAL ENGINEERING, W. W. F. Pullen and L. D.

There is a Training Department for Teachers, a Hygiene Department, Coueslant; ELECTRICAL ENGINEERING, A. J. Makower; and an Art School. CHEMISTRY, J. B. Coleman, J. C. Crocker, and F. H. Lowe; Students can reside in the College, MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lister

Particulars on application to the PRINCIPAL. and L. Lownds ; BOTANY, H. B. Lacey and T. G. Hill; GEO. LOGY, A. J. Maslen. In the evenings similar Courses will be con. ducted, but at reduced sees. Also TECHNICAL DAY COURSES

BEDFORD COLLEGE FOR WOMEN. of three years' duration have been arranged as a preparation for the Engineering, Electrical and Chemical and Metallurgical professions.

(UNIVERSITY OF LONDON.) The Laboratories and Workshop are open for RESEARCH under the

YORK PLACE, BAKER STREET, W. direction of the Principal and the Heads of Departments. Further particulars may be obtained on application to the SECRETARY,

DEPARTMENT FOR PROFESSIONAL TRAINING IN

TEACHING. who will send either the Day College Prospectus and Calendar or the Evening Class Prospectus for 31d. The Prospectus may be had at

HEAD OF THE DEPARTMENT: Miss H. ROBERTSON, B.A. the Office for id.

Students are admitted to the Training Course in October and January,

The Course includes full preparation for the Examinations for the UNIVERSITY OF GLASGOW.

Teaching Diplomas granted by the Universities of London and Cambridge, ADDITIONAL EXAMINERSHIPS.

held annually in December,

A Course of Lectures on Schcol Hygiene is held on Saturday mornings. The University Court of the University of Glasgow will shortly proceed Full particulars on application to Miss ROBERTSON. to appoint the following Additional Examiners :(a) For Degrees in Arts and Science-ONE EXAMINER in MATHE- BEDFORD COLLEGE FOR WOMEN. MATICS. Annual salary, £70.

(UNIVERSITY OF LONDON.) (1) For Degrees in Arts, Science and Medicine-ONE EXAMINER in NATURAL PHILOSOPHY (including Practical Physics).

YORK PLACE, BAKER STREET, W. Annual salary, 670. Candidates should be qualified both on the The Council are about to appoint a Lady as HEAD of the TRAINING Mathematical and Experimental side.

DEPARTMENT. ONE EXAMINER in CHEMISTRY. Annual salary, £50.

Applications must be sent by November 25 to the SECRETARY of the The appointments will be for three or four years from January 1, 1905,

College, from whom further information may be obtained. and in addition to the above mentioned salaries, hotel and travelling

H. WALTON, Secretary. expenses will be paid. Candidates should lodge twenty copies of their application and testi

(THEORY AND monials with the undersigned on or before November 12, 1904.

PRACTICE)
ALAN E. CLAPPERTON,

In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for Secretary, Glasgow University Court. MEDICAL EXAMS. 91 West Regent Street, Glasgow.

Especial Course of Instruction in THERAPEUTICS, PHARMA

COLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY SWINEY LECTURES ON GEOLOGY.

EXAM.

Mr. FREDERICK DAVIS, The Laboratories, UNDER THE DIRECTION OF THE TRUSTEES OF THE (Registered in Column B (Advanced Education), Teachers Registration BRITISH MUSEUM.

Councii, Board of Education, S.W.), A Course of Twelve Lectures on “GEOLOGY-THE RECORD 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C. AND ITS INTERPRETATION” will be delivered by John S. Flett, M.A., D.Sc., F.R.S.E., in the Lecture Theatre of the Victoria and Albert TO SCIENCE AND MATHEMATICAL Museum, South Kensington (by permission of the Board of Education), on Mondays, Wednesdays, and Fridays, at 5 p.m., beginning Monday,

MASTERS.-January (1905) Vacancies.-Graduates and other well November 7, and ending Friday, Deceinber 2. Each Lecture will be illus

qualified Masters seeking posts in Public and other Schools for next trated by means of Lantern Slides and Lime-light. Admission to the

term should apply at once, giving full details as to qualifications, &c.,

to Messrs. Griffiths, SMITH, POWELL & SMITH, Tutorial Agents Course free. Entrance from Exhibition Road.

(Estd. 1833), 34 Bedford Street, Strand, London. Immediate notice By order of the Trustees,

of all the best vacancies will be sent.
E. RAY LANKESTER, Director.
British Museum (Natural History),
Cromwell Road, London, S.W.

Wanted for Protestant Irish School after

the Christmas holidays, a Master to teach Modern Languages and UNIVERSITY COLLEGE, LONDON. Auxiliary Subjects. An Englishman who has resided abroad preferred.

Salary, £150 per annum ; non-resident. Also a Science Master with (UNIVERSITY OF LONDON.)

Certificates for the teaching of Drawing. Salary, 6150 per annum;

non-resident. Applications, with copies of Testimonials and Photos if A Course of Eight Lectures on "Current Theories of the Hereditary Process" will be given at Five o'clock on the following Tuesdays :

possible, to be sent to HEAD MASTER, Office of this paper. November 22 and 29, December 6 and 13, January 24 and 31, February 7 and 14, by W. F R. WELDON, M.A., D.Sc., F.R.S., Linacre Professor of

SCIENCE & MATHL. APPTS.-(1) Public Comparative Anatomy in the University of Oxford.

Sch., Nat. Sc. and Drawg., £150 + fees; valuable post to good man. Syllabuses and Cards of Admission may be obtained gratis by members (2) Chem. and Physics-little English. Games preferred. *£120, res. of the University and of Schools of the University, and on payment of (3) Chem. + Magnetism and Electricity. 6100, res. Many January sos. 68. by others.

Apots. Messrs. NEEDES & SELLICKS, Scholastic Agents, Clock WALTER W. SETON, M.A., Acting Secretary, House, Arundel Street, Strand.

COACHING

BROWNING'S ASTRONOMICAL TELESCOPES

“UNIVERSITYTELESCOPE (as figured), with 3 in.

O.G., 3 eyepieces, star finder, vertical steadying rod, and fixing on claw stand

in case £10 10 0 Do. do. with 34 in. 0.G.

£15 15 "LUNAR” TELESCOPLE, with (Casers/-} £5 10 o “COLLEGE” TELESCOPE, with 3 in.

selected O.G., 3 eyepieces on claw stand, in case £6 10 0 "STUDENT'S" TELESCOPE

£5 5 0 4 in. Brass Body ALT-AZIMUTH TELESCOPE

£30. O EQUATORIAL TELESCOPE, 3 in.

0.G., best Equatorial mounting, on
strong oak stand

£25 0 0 PRICE LISTS POST FREE.

Man'fg.
Optician,

78 STRAND, LONDON.

WOOLWICH POLYTECHNIC.

Principal ... WILLIAM GANNON, M.A. The Governors invite applications for the following appointments :(1) TEACHER of MATHEMATICS and EXPERIMENTAL PHYSICS. Commencing salary. 6160 per annum. Experience of secondary school work essential. (2) TEACHER of MATHEMATICS

and EXPERIMENTAL PHYSICS. Commencing salary, £150 per annum. Experience of tech. nical school work essential

Further particulars and application forms may be obtained from the PRINCIPAL on receipt of a stamped addressed foolscap envelope. Last day for receiving applications is November 7.

A. J. NAYLOR, Clerk to the Governors. UNIVERSITY COLLEGE OF NORTH

WALES, BANGOR. (A CONSTITUENT COLLEGE OF THE UNIVERSITY OF WALES.)

AGRICULTURAL DEPARTMENT. An ASSISTANT LECTURER in AGRICULTURE will shortly be appointed. Applications should be sent in not later than November 7. For further particulars apply to

JOHN EDWARD LLOYD, M.A.,, October 12. 1904.

Secretary and Registrar. BRUNTS' TECHNICAL SCHOOL,

MANSFIELD.
A FIRST ASSISTANT MISTRESS is required in the above Secondary
Mixed School, to commence duties after the Christmas Holidays.

Subjects essential. General Biology and English. Capacity to teach
Physical Exercise will be a recommendation.
Salary, £100 per annum, advancing to £150.

Further particulars and forms of application may be obtained from the undersigned.

W. N. SARLL. Bath Lane, Mansfield. BRUNT'S TECHNICAL SCHOOL,

MANSFIELD. An ASSISTANT MASTER is required to teach Woodwork and Lower Fornl Subjects. Salary, 695 per annum Apply, stating age, qualifications and experience, with names of three references, to

C. E. STACEY, B.A., B.Sc., Head Master. THE VERDIN TECHNICAL SCHOOL.

SECONDARY DAY SCHOOL. The Winsford Higher Education Committee invite applications for the post of ASSISTANT MASTER in the above Secondary Day School, at a commencing salary of £120 per annum. Special qualification, Chemistry; but applicants must be able to give instruction in English subjects (or other available subjects of the School Curriculum). The Master appointed will further be required to teach Chemistry on iwo evenings per week during the winter months in the Evening Technical School, and will be expected to take part in the School Games (Hockey and Cricket).

Applications, endorsed “Assistant Master," stating age, accompanied by copies of not more than three testimonials, should

be delivered to the HEADMASTER, Verdin Technical Schools, Winsford, Cheshire, not later than Monday, November 14.

JNO. H. COOKE, Winsford, Cheshire,

Clerk to the Committee. November 1, 1904. OLDBURY SECONDARY SCHOOL AND

PUPIL TEACHERS' CENTRE. The Governors require, after Christmas, an ASSISTANT MASTER to teach ordinary Form Subjects and Science or Mathematics. Salary, £120 per annum.

Further particulars may be obtained from the SECRETARY, to whom applications should be forwarded on or before November 26, 1904.

H. A. ANDERSON, Secretary. Technical Schools, Oldbury. SMETHWICK PUPIL TEACHERS'

CENTRE,

NEAR BIRMINGHAM. An ASSISTANT MASTER is required who shall have special qualifi. cations in Science. Salary, £130, rising to £150. Applications, with testimonials, &c., to be sent in not later than November 7 to

J. N. BIRCH, B.A., Principal. CITY OF BIRMINGHAM.

MUNICIPAL TECHNICAL SCHOOL. The services of a LECTURER in ELECTRICITY and PHYSICS are required in January next. The commencing salary offered is 6140. The last date for sending in applications is November 19 next. Full particulars of the post will be forwarded on application to

GEO. MELLOR, Secretary. Offices of the School, Suffolk Street October 17, 1904.

OWEN'S SCHOOL, ISLINGTON WANTED in January, PHYSICS MASTER and CHEMISTRY MASTER. Must have had experience in good laboratories, and be able to lecture and illustrate by experiments in an efficient manner. There are two Science Masters on each side. Commencing salary, £150. Apply at once, giving age, qualification, experience, and copies of ihree recent testi. monials, to the HEAD MASTER.

JOHN BROWNING, Optician.

SANGER-SHEPHERD
NEW PATTERN AUTOMATIC ARC-LAMP

FOR LABORATORY WORK. 125 Candle Power. A low power Lamp, invaluable as

white light illuminant for

Microscopic,

Spectroscopic, and Photographic Work. SPECIFICATION. – Automatic Arc Lamp in nickel-plated ventilated cover, suspended on adjustable stand with self-contained resistance, fine centreing adjustment by screwed nut suspension. As open or closed arc, requires only if amperes on 100/110 volt direct current circuit. Complete with flexible cord and plug, for instant attachment to

ordinary bayonet lamp socket. Burns 20 hours without attention.

With Stand (as shown), £4 : 10 : 0

Lamp only, £2 : 15 : 0 Also supplied for 200

volts.

SANCER-SHEPHERD & CO.,

5, 6 & 7, Gray's Inn Passage, Red Lion St., Holborn, London, W.C.

REYNOLDS & BRANSON, LTD.,

THE NEW AITCHISON PATENT PRISM BINOCULAR. MANY IMPROVEMENTS. LARGE OBJECT GLASSES.

VARIABLE DIAPHRAGMS, &c.

Scientific Instrument Makers to the Indian Government and Science and Art Department.

LABORATORY FURNISHERS AND

MANUFACTURING CHEMISTS.

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NEW PHOTOGRAPHIC DARK ROOM LAMP

THE "RYSTOS" ELECTRIC LAMP

(No. 1) For Standing or Hanging, with Cord and Plug to fit ordinary lamp socket, and Reversing Switch. The insulated switch handle on top will be found safe and well adapted for turning on the current to either ruby or white light, or instantly exchanging the one for the other. The white light is convenient when making bromide prints, transparencies, &c. The ruby glass provided is of special quality, being spectroscopically tested. It gives a soft diffused light, while its semicircular shape secures ihe illumination of the

whole developing table. REYNOLDS & BRANSON LT

Dir ensions, 4 in. x 8} in.

Price £l ls. (When ordering, please mention voltage. )

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LAMPS FOR GAS ALSO WITH BYE-PASS.

New Photographic Requisite List on application. 14 COMMERCIAL STREET, LEEDS.

428 STRAND, and Branches, LONDON, MR. EDWARD ARNOLD'S NEW BOOKS. THE CHEMICAL SYNTHESIS

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Technical College, Finsbury.

Super Royal 8vo. 2IS. net. THE BECQUEREL RAYS AND THE PROPERTIES OF RADIUM.

By the Hon. R. J. STRUTT,

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THE THEORY OF OPTICS.
By ARTHUR SCHUSTER, Ph.D., Sc.D., F.R.S.,
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The Premiums are so moderate that at most ages an Assurance of £1,200 or £1,250 may generally be secured from the first for the same yearly payment wbich would elsewhere assure (with profits) 21,000 only.

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE.

To the solid ground
Of Nature trusts the mind which builds for aye."—WORDS WORTH.

Edited by them.

THURSDAY, NOVEMBER 3, 1904.

cannot see by what possible stretch of the imagination the achievements of, say, Marconi can be traced back to the prophecies of Galileo in 1632.

Mr. Sewall's method of compiling history appears APPLIED ELECTRICITY.

to consist chiefly in making extracts from patents. (1) Wireless Telegraphy. By C. H. Sewall. Pp. 229.

Page after page of the book before us contains nothing (London : Crosby Lockwood and Son, 1903.) Price

more than reprints from the patents of Lodge, Marconi, los. 6d. net.

Fessenden, and others, sometimes verbatim in inverted (2) Electricity in Agriculture and Horticulture. Ву

commas, at others with slightly altered context Prof. S. Lemström. Pp. iv + 72. (London : The

as original matter. We imagine it must be easier Electrician Printing and Publishing Co., Ltd., 1904.)

to write books in this way than it is interesting to read (3) Modern Electric Practice. Vol. iv.

Mr. Sewall would have been much better Magnus Maclean.

Pp. viii + 304.
(London : The

advised, we think, to digest his material properly and Gresham Publishing Co., 1904.)

present it to his readers in some more acceptable form. (4) The Theory of the Lead Accumulator.

By F.

He could then have given a connected account of the Dolezalek. Translated by C. L. von Ende. Pp. remarkable developments that have followed the disxii +241.

(New York: John Wiley and Sons; coveries of Maxwell and Hertz which would have been London : Chapman and Hall, Ltd., 1904.) Price

of great practical use to students of the subject. At 105. 6d. net.

present we doubt if his book is intelligible to the (5) Electric Motors. By H. M. Hobart. Pp. x+458.

amateur or useful to the expert. (London : Whittaker and Co., 1904.) Price 12s. 6d.

(2) The late Prof. S. Lemström occupied himself for net.

many years with experiments on the effect of electricity (6) Notices sur l'Électricité. By A. Cornu. Pp. vii +

on growing plants, and this little book contains the 274. (Paris : Gauthier-Villars, 1904.) Price 5 results of his work. If the conclusions at which the francs.

author arrives are confirmed by the work of other in(7) L'Année Technique (1902–1903). By A. Da Cunha. vestigators, the subject is one which merits the most Pp. 303. (Paris : Librairie Gauthier-Villars, 1903.) careful consideration by all agriculturists. Practically Price 3.50 francs.

only one type of experiment was tried; an influence LTHOUGH wireless telegraphy is of such machine was connected with one pole to earth and the

recent development, it is apparently regarded other to a wire network over a field in which the crops by many as a legitimate subject for historical writing. were being grown. A discharge current could thus be The first volume before us is one of several which have passed either from the network to earth or vice versa appeared in the last three or four years in which the for any desired number of hours a day. The experihistorical progress of wireless telegraphy is dealt with ments were tried on a comparatively large scale in rather than its scientific principles. The book possesses several different localities. The effect produced by to our mind the same faults which characterise all the this treatment was remarkable.

There was other similar publications which we have read; there average excess of the crop of the experimental field is a lack of discrimination in the selection of material over that of a control field of 45 per cent. ; the which is likely to 'leave the untechnical reader in a

varies considerably with the nature

of state of considerable confusion. Wireless telegraphy the crop and the conditions, soil, weather, &c. Not as we know it to-day is wholly concerned with Hertzian only is this increase in quantity produced, but there is wave telegraphy, and even if accounts of the experi- also often an improvement in quality and a diminution ments of Lindsay and others in telegraphy by earth or in the time taken for the plants to mature. This last water conduction should be regarded as legitimate, we is a factor often of great importance to the grower,

(")

an are

excess

conse

who can realise much higher prices by selling early in the book is divided into two parts, the first dealing the season. Prof. Lemström calculated that in the case with continuous and the second with alternating of wheat the outlay on a field of 25 acres will be repaid current motors. The relative advantages of different in two or three years, and that afterwards a net profit types are considered in detail, and there are numerous of fol. a year or more can be realised. We cannot here calculations of motors of different types and capacities. enter into the details of the working, such as the best In addition, there are a large number of curves, time of electrification, the effect of wet and dry weather, diagrams, and photographs. and so forth, but we should strongly advise those

(6) The essays which are comprised in M. Cornu's interested in the subject to study this book carefully; little book were written with a special and rather they will find it full of valuable suggestions, and the peculiar object, the author having been requested by time spent in reading it will be amply repaid.

some of his old pupils, who had been unable to keep (3) We have already reviewed the first three volumes

touch with the rapid development of electrical engineerof this publication, so that it is only necessary here to ing, to write for them something which would enable refer briefly to the matter contained in the present them to appreciate better the technical or semi-technical volume. This is devoted to electric tramways, and literature of to-day. These Notices” is divided into seven chapters, dealing with overhead quently of a somewhat elementary character, nor can construction, feeders, surface contact systems, con- the book be regarded in any sense as a text-book of duit systems, rolling stock, electric boats and motor electricity. But M. Cornu has succeeded in writing a cars, and electric traction on railways. The defects book which should appeal to a very much larger to which we alluded in our previous review are not audience than that for which it was originally inso noticeable in this volume, which furnishes a good tended; one cannot look through its pages without description of a very important branch of electrical realising at every point that it is the work of a master, engineering. The excellence of the illustrations is a

and such works repay study by all—the most advanced characteristic of the whole production, and is a par- as well as the most elementary students. The beticularly valuable feature in the present instance, as the ginner will find here ideas expressed clearly and subjects are such that they cannot be effectually de- concisely, and cannot fail to derive great benefit from scribed without numerous photographs and diagrams. the book as an introduction to more detailed treatises.

(4) This exceedingly interesting monograph on the The engineer will see well known facts expressed in much debated theory of the chemical reactions taking new and suggestive language, and will doubtless have place in the lead accumulator is probably already well his own views enlarged in consequence. The subjects known in the original German to those who have con- dealt with are the correlation of the phenomena of cerned themselves specially with this subject. Since static and dynamic electricity, generators, transmission the book first appeared the discussion has progressed of power and polyphase currents, and would a stage further, so that the English translation may strongly recommend anyone interested in any of these be said to be out of date to a certain extent. This is, matters to spend a few hours reading M. Cornu's however, the penalty that the average English student admirable booklet. has to pay for the neglect of his schoolmasters to (7) We cannot help being conscious that the end of teach him German, and he will probably therefore 1904 is rather late in the day to review a book which welcome the appearance of an English translation. contains a résumé of the technical achievements of Herr Dolezalek treats the subject from the standpoint of 1903. Still, as we gather that this publication is Nernst's osmotic theory, and shows that thermo- intended to appear annually, this notice may be of chemical considerations all point to the validity of the some service in directing readers' attention to the sulphate theory originally advanced by Gladstone and volume dealing with this year's progress, which we Tribe. Whether the author will succeed in satisfying imagine will appear very soon; in addition, it may be others to the same extent as he has apparently satisfied pleaded that the lapse of time enables one to see matters himself may be regarded as open to question, but in more in the right perspective, and so to form a better any case the book is one which cannot be neglected by estimate of the value of M. Da Cunha's work. The anyone wishing to study this complicated but fascin- book ranges over a great variety of subjects. Thus ating problem.

we find at one place a mathematical calculation of the (5) The design and construction of electric motors mechanical problems involved in “ looping the loop,” is becoming daily a matter of more importance to and in another a discussion of alcoholism and temperelectrical engineers on account of the very rapid ance worthy of the columns of a daily paper in the extension of the use of electricity for power purposes. silly season. Between these extremes lie such subjects When one considers the enormous number of tramcars, as the progress in wireless telegraphy, automobilism, lifts, factories, &c., which are driven by electricity, it aërial navigation, and the hundred and one other is easy to see not only how important the subject is, but technical developments which are taking place in all also how very varied is the work which the electric branches of applied science. To the engineer the book motor is called upon to perform. If the development can serve no other purpose than to while away an idle now is great, in a few years' time, when some of the hour or so. The general reader who is interested in numerous power schemes are more matured, it will be scientific and technical progress may read it with both much greater still. The student of electrical engineer-profit and pleasure. He will find the descriptions clear, ing may find here ample scope for his abilities, and he the style agreeable, and the illustrations and diagrams cannot consult a better guide than the volume before us. in many cases excellent.

M. S.

we

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