At the J. L. S. HATTON, Director of Studies. SOUTH-WESTERN POLYTECHNIC, Manresa Road, Chelsea, S.W., Day College Courses of thirty hours per week are conducted in preparation for the London University Degrees of B.Sc. in Mechanical and Electrical Engineering, in Chemistry, Physics and the Natural Sciences. The composition fee for the Session of three terms, 1904-1905. is £15. These Courses are recog ni-ed for "Internal Students of the University, and consist of lecture and laboratory instruction. The Courses are conducted by:MECHANICAL ENGINEERING, W. W. F. Pullen and L. D. Coues ant; ELECTRICAL ENGINEERING, A. J. Makower; CHEMISTRY, J. B Coleman, J. C. Crocker, and F. H. Lowe; MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lister 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 £2 per Session. Also TECHNICAL DAY COURSES of three years' duration are arranged as a preparation for the Engineering, Electrical and Chemical and Metallurgical professions. The Laboratories and Workshop are open for RESEARCH under the direction of the Principal and the Heads of Departments. Further particulars may be obtained on application to the SECRETARY, who will send either the Day College Prospectus and Calendar or the Evening Class Prospectus for 3d. The Prospectus may be had at the Office for id. ENRY CUNYNGHAME, Esq., C. B., M.A., M. Inst. E. E., will on JESDAY next, December 27, at Three o'clock, begin a Course of Six cctures (adapted to a Juvenile Auditory) on "ANCIENT AND MODERN METHODS OF MEASURING TIME" (Experimentally Illustrated). Subscription (for Non-Members) to this Course, One Guinea (Children under sixteen, Half-a-Guinea); to all the Courses in the Season, Two Guineas. Tickets may be obtained at the Institution. BIRKBECK COLLEGE. BREAMS BUILDINGS, CHANCERY LANE, F.C. FACULTY OF SCIENCE. Chemistry Physics... Mathematics Botany JJ. E. MACKENZIE, Ph.D., D.S B. W. CLACK, B.Sc. E. H. SMART, M.A. W. G. BIRT, B.A., B.Sc. A. B. RENDLE, M.A., D.Sc. F. E. FRITSCH, Ph. D., B.Sc H. W. UNTHANK, B. A., B.Sc GEO. F. HARRIS, F.G.S. Geology & Mineralogy Assaying, Metallurgy & Mining. GEO. PATCHIN, A.R.S.M RESEARCH in Chemistry and Physics in well-equipped laboratories French, German, Spanish, Russian, Dutch, & Italian Classes. EVENING CLASSES also in Biology, Physiology, Practical Geometry, Building and Machine Construction, Steam, Theoretical and Appian Mechanics, Land and Quantity Surveying, and Estimating. Calendar 6d. (post free 8d.), on application to the SECRETARY. CITY OF LONDON COLLEGE. WHITE ST., MOORFIELDS, E.C. (Near Moorgate and Liverpool Street Stations.) PRINCIPAL: SIDNEY HUMPHRIES, B.A., LL.B. (Cantab) EVENING CLASSES in ALL BRANCHES of SCIENCE Well-equipped LABORATORIES for Practical Work CHEMISTRY, BIOLOGY, BOTANY, GEOLOGY, and all branches of PHYSICS. Special Courses for London University Matric., Inter., and Final BA. B.Sc., Conjoint Board, Pharmaceutical and other examinations. Claes are also held in all Commercial Subjects, in Languages, Literature and àn All Classes are open to both sexes. SATURDAY COURSES for Matric., Inter., and Final B. A., B.Sc. DAY COMMERCIAL SCHOOL. Prospectuses, and all other information, gratis on application. DAVID SAVAGE, Secretary. THE LONDON SCHOOL OF TROPICAL MEDICINE. (UNDER THE AUSPICES OF HIS MAJESTY'S GOVERNMENT.) CONNAUGHT ROAD, ALBERT DOCK, E. (IN CONNECTION WITH THE HOSPITALS OF THE SEAMEN'S HOSPITAL SOCIETY.) The next SESSION commences on MONDAY, JANUARY 16, 1* For Prospectus, Syllabus, and other particulars, apply to the Secretary P. MICHELLI, Esq., Seamen's Hospital, Greenwich, S.E. HIGHER MATHEMATICS FOR SCIENCE AND OTHER STUDENTS. Correspondence Tuition by highly qualified graduates of Oxford, Cambridge, Londor and Royal Universities, in Algebra, Trigonometry, Theoretical Mechanics, Den ential and Integral Calculus, Pure Geometry, Geometrical Drawing, & Departments are at work preparing for London and Royal Univer er Examinations, Science and Art, Civil Service Examinations, and at Pra Preliminaries. Apply to Mr. J. CHARLESTON, B.A., Burlington Com pondence College, 8 Crescent Grove, Clapham, S. W. A Gentleman engaged in Pure and Applied Research would be glad to hear of a commercial laboratory . equipped electrically, with a good mechanic, glass blower and cher sa where he could pursue his experiments with expedition -App! "1833," c/o NATURE. Wanted in a Provincial Town South of Ireland, a Practical SCIENCE MASTER, B.Sc. Liberal salary t a suitable Master, capable of helping at the Higher Mathematis languages, English, French and Latin.-" Box 1834," c/o NATURE Office. For other Scholastic Advertisements, see page 1xxvi. Illustrated Booklet post free. THE YOST TYPEWRITER CO., LD., HEAD OFFICE: 50, HOLBORN VIADUCT, LONDON, E.C. Branches in all large towns. EXCELLENT Photographs in Colour are obtained with our smaller lens filter Outfits, complete from 25/-; but for general work, Landscapes in changing light, Portraiture or Photomicrography where rapid exposures in succession are necessary, the Repeating Back with Colour Filters is recommended as the best all round appliance. It may be attached to any, or whole-plate camera or glass plate Kodak, by means of a panel cut to correspond and interchangeable with the ordinary dark slide. This does not in any way interfere with the use of the camera for ordinary work. The three Colour Filters are held in a frame, clipped in front of the double dark slide which carries the two plates, each large enough to record the three negatives side by side, when the slide is pushed past the opening in the outer case. With this Outfit, even a beginner will secure three-colour negatives with the ease and certainty of an ordinary photograph. Repeating Back Attachments, with Filters complete, from 90/Send for New Booklets, post free to readers of "Nature," or call and see results obtained by amateurs. SANGER-SHEPHERD & CO., 5, 6, 7 Gray's Inn Passage, Red Lion St., Holborn, London. LONDON SCHOOL OF TROPICAL MEDICINE, ROYAL ALBERT DOCK, LONDON, E. PROTOZOOLOGY.-The School is about to establish a special depart. ment for the study and teaching of this subject, and invites applications from gentlemen willing to serve as Teachers and to occupy themselves in research work. Candidates holding medical qualifications will be preferred. The appointment will be for six years, and the pay will commence at £250, rising by yearly increments of £50 to £500 per annum. Luncheon and tea will be provided. The Protozoologist will be expected to devote his whole time to the service of the School, and to be prepared to teach for one hour per diem in the aggregate if required. Applications, stating age, together with copies of not more than three recent testimonials, to be sent in on or before January 2, 1905, to the undersigned, from whom further particulars may be obtained. By order, December 14, 1904. P. MICHELLI, Secretary. LONDON SCHOOL OF TROPICAL MEDICINE, ROYAL ALBERT DOCK, LONDON, E. HELMINTHOLOGY.-The School is about to establish a special department for the study and teaching of this subject, and invites applications from gentlemen willing to serve as Teachers and to occupy themselves in research work. Candidates holding medical qualifications will be preferred. Luncheon The appointment will be for six years, and the pay will commence at £250, rising by yearly increments of £50 to £500 per annum. and tea will be provided. The Helminthologist will be expected to devote his whole time to the service of the School, and to be prepared to teach for one hour per diem in the aggregate if required. Applications, stating age, together with copies of not more than three testimonials, to be sent in on or before January 2, 1905, to the undersigned, from whom further particulars may be obtained. December 14, 1904. By order, P. MICHELLI, Secretary. THE VICTORIA UNIVERSITY OF MANCHESTER. The Council desires to proceed to the APPOINTMENT of a PROFESSOR of ENGINEERING. The Professor will be responsible for the organisation of the Engineering Department, and will have the direction of the Engineering Laboratory. He may take a consulting practice under specified conditions. His stipend will be composed of a fixed salary and a share of the fees, and the Council guarantee that the total income will not be less than £1000 per annum during the first three years. A detailed statement of the conditions of appointment may be obtained from the Registrar. Applications, with references and such testimonials (not exceeding three in number) as the candidate may desire, should be sent on or before February 15 to the REGISTRAR. THE GROCERS' COMPANY'S SCHOLARSHIPS. For the purpose of encouraging original research in Sanitary Science, the Grocers' Company offer Two Scholarships, each of 4300 a year, with an allowance to meet the cost of apparatus and materials and for general expenses in connection with the work, tenable for two years, subject to the conditions of the scheme under which they are established. Applications must be sent in before April to the CLERK OF THE GROCERS' COMPANY, Grocers' Hall, London, E.C., from whom de necessary forms and further information may be obtained. SCIENCE AND MATHEMATICAL MASTERS. Messrs. NEEDES & SELLICKS, (Medical and SCHOLASTIC Agency, Estab. 1860), Clock House, Arundel Street, Strand, W.C. Applications are invited for the following appts. :-(1) Public Sch, Nat. Sc. and Drawg., £150+fees; valuable post to good man, (2) Chem, and Physics-little English. Games preferred. £120, res. (3) Chem. + Magnetism and Electricity. £roo, res. (4) Wrangler, Public School. £110, res (5) County School, Maths. £110, non-res. Many January Appointmenta For other Scholastic Advertisements, see page lxxiv. LANTERN and MICROSCOPICAL SLIDES In all branches of NATURAL HISTORY, from 6/- per dozen. (As supplied to the Principal Universities, Technical Schools, &c.) LANTERNS, MICROSCOPES, NATURE STUDY appliances, &c. FOR SALE, at Reduced Prices. MICROSCOPIC SLIDES (dispersal of Mr. Hornell's collection), see Micro. Editor's note, June No. of Knowledge, Sections of Flower Buds, &c., also Marine, suitable for Students and Exhibition, new, prices frum 3d. each. MICROSCOPE, Baker's D. P. H. and fittings, £7 165.; Beck's London and fittings. £6 6s.; many others, Pillisher, Ross, &c. Several Objectives Bull's-Eye Condensers. Abbe Condensers. Eyepieces by Leitz, &c. Goer: PRISMATIC BINOCULARS. Photographic Lenses. SURGEON'S OPERATION Outfit, very fine, new, for sale, cheap. Collection of Shells. Many other useful articles. Send for lists. Mr. HERBERT CLARKE, 104 LEADENHALL STREET, LONDON. ANALYSIS APPARATUS. Rapid-Easy of Manipulation-Accurate -and Clean in Use. This apparatus, which is fully described in the Journal of the Society of Chemical Industry, February 28, 1903, p. 187, has been carefully designed by the inventor for the rapid and accurate performance of general and technical gas analysis. It will be found to have decided advantages over other apparatus, as fully set out in our descriptive circular, which will be sent on application. Water Jacket, containing Measuring Tube with Certificate, Levelling Tube, and new pattern Correction Tube on "Kew principle." Illuminating Lamp, Magnifying Lens, the whole mounted on Mahogany Stand and with stout walled tubing, but without Mercury, Induction Coil, or Pipettes £8 8 0 Absorption Pipettes mounted on Polished Mahog BRADY & MARTIN, LTD., Scientific Apparatus Makers, NEWCASTLE-UPON-TYNE. W.G.PYE & CO. "GRANTA" WORKS, CAMBRIDGE. MACMILLAN & CO.'S LIST. VOLUME VII. NOW READY. THE CAMBRIDGE NATURAL HISTORY. EDITED BY S. F. HARMER, Sc. D., F. R.S., AND A. E. SHIPLEY, M.A., F.R.S. FISHES (exclusive of the Systematic Account of Teleostei). By T. W. BRIDGE, Sc.D., F.R.S. FISHES (Systematic ASCIDIANS AND AMPHIOXUS. By W. A. HERDMAN, D.Sc., F.R.S. SIR WILLIAM HENRY FLOWER, K.C.B., Late Director of the Natural History Museum, and President of the Royal Zoological Society. A Personal Memoir. By CHARLES J. CORNISH, M.A., F.Z.S. With Photogravure Portraits. 8vo. 8s. 6d. net. THE NATION (U.S.A.)." For details of the life we must refer to the volume. . . . Flower was a man of noble presence, striking manly beauty, and of a most kindly and unaffected nature. . . . His marriage proved ideal in its results. . . . He was a self-sacrificing worker, a miracle of persistent, steady devotion to the profession he had at heart. . . . He was . . . the first man in Great Britain to elevate the keeping of a museum into one of the higher professions; was one of the first in the world to introduce modern ideas into the administration of museums, and the originator of many most important advances. . . . He was an excellent comparative anatomist, a specialist in the first rank of students of the Cetacea. . . a lover of poetry, of outdoor life, of children, and animals. Not a genius, he was lamented more than any scientist of his generation, in his own country, and by those of other lands who had had the privilege of his friendship, and knew his worth in spite of his modesty. . . . It was well that a memoir should be written to keep him and his work in remembrance." MUSEUMS JOURNAL.-"That which will most strongly interest readers of the memoir, and all who have personal recollection of Sir Wiliam Flower, is the character of the man.... No one can read the simple and beautiful chapter (at the conclusion of the memoir) in which Lady Flower writes of the end of that noble and unselfish life without emotion." REVIEW OF REVIEWS.-" It is a well-told record, not too long, of 67 years of active life. Quite apart from the interest of the book as the study of the eminent Zoologist, there is the light thrown on several interesting personalities-DEAN STANLEY, of whom there is a charming description, HUXLEY, QUEEN VICTORIA, and others." CAMBRIDGE REVIEW.-"Sir William Flower made our Natural History Museum the model on which all modern museums are founded." AN INTRODUCTION TO THE CALCULUS. Based on Graphical Methods. By GEORGE A. GIBSON, M.A., F.R.S. E., Professor of Mathematics in the Glasgow and West of Scotland Technical College. Crown 8vo. 3s. 6d. NEW EDITION REVISED IN ACCORDANCE WITH THE FOURTH GERMAN EDITION. THEORETICAL CHEMISTRY FROM THE STANDPOINT OF AVOGADRO'S HARVEY PEAK (BY APPOINTMENT TO THE ROYAL INSTITUTION OF GREAT BRITAIN.) WAVE MOTION. Makers of the new Apparatus illustrating Wave Motion, designed and used by Dr. J. A. FLEMING in the Christmas Lectures at the Royal Institution. READING MICROSCOPES, RESISTANCE COILS, &c. 56 CHARING CROSS ROAD, LONDON, W.c. 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