CROSSLEY BROS., LTD., GREAT REDUCTION GAS CONSUMED. Up to the end of 1904, over 51,000 gas and oil engines had been delivered, represent ing about threequarters of a million actual horse-power. OPENSHAW, MANCHESTER NEW MICROSCOPIC SLIDES From the New Issue of W. WATSON & SONS' No. 3 CATALOGUE, just published. Tsetse Flies (G. palpalis), whole insect Dissections of all parts may be had mounted separately. Also in Post Free on application. Send for Special Descriptive List. Fly hatched from above, Auchmeromyia luteola 7 6 Set of 16 Slides illustrating the development of an Ascidian Trypanosoma Brucei (Tsetse Fly disease) Eggs of Emperor Moth, fertile and sterile, on 1 slide 3 6 Blood-sucking Maggot (from the Congo) Set of 5 Slides of the Garden Spider, showing different stages of SEND FOR THE ABOVE NEWLY PUBLISHED CATALOGUE OF MICRO. OBJECTS. 76 WATSON'S CATALOGUE OF MICROSCOPES (158 pages) is of special interest to all Microscopists, post free. W. WATSON & SONS, 313 High Holborn, London, W.C. Branches-16 FORREST ROAD, EDINBURGH, and 2 EASY ROW, BIRMINGHAM. THE CORRESPONDENTS' CAMERA. OR TRIPOD Originally made for the use of Newspaper Men in South Africa, and since used all over the World. THIS Camera has been designed for the use of correspondents, artists, and other travellers who, while requiring a Camera possessing the greatest stability, cannot spare the space for a regular field camera in addition to a hand camera. It is made of the best mahogany, carefully finished and covered with hard morocco leather, or polished in natural colour or ebonised at the same price. It is admirably adapted for Telephoto work. Owing to the use of wood instead of metal, wherever possible, this camera is lighter than many of less substantial make. EACH SIZE PERMITS OF THE USE OF THE SINGLE COMPONENTS OF A STIGMATIC OR OTHER CONVERTIBLE LENS. PRICE, including 3 Double Slides, but j 41 by 31. 6) by 41. £7 15s. Od. J. H. DALLMEYER, Ltd., 25 NEWMAN ST., OXFORD ST., LONDON, W. MAKERS OF THE CELEBRATED DALLMEYER LENSES. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 breac Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAS AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, August 3, 1905 Geography FACULTY OF SCIENCE. (Professor HEATH, Mr. PREECE and Mr. GUEST. Professor PovNTING, Mr. SHAKESPEAR, Dr. BARLOW and Dr. DENNING. (Professor FRANKLAND, Dr. MCKENZIE, Dr. FINDLAY, Mr. MOORE and Mr. TINKLER. Professor BRIDGE and Mr. COLLINGE. Professor HILLHOUSE and Dr. EWART. Professor LAPWORTH and Mr. RAW. Professor WATTS. (Professor BURSTALL, Mr. PORTER, Mr. HAZEL, Mr. GILL and Mr. SINCLAIR. Professor DIXON and Mr. HUMMEL. Professor KAPP, Dr. MORRIS and Mr. Lister. (Professor TURNER, Mr. HUDSON and Mr. RICKETTS. Professor REDMAYNE and Mr. ROBERTON. FACULTY OF ARTS. (Professor SONNENSCHEIN, Mr. CASPARI and Mr. CHAMBERS. Professor CHURTON COLLINS and Mr. Cowl. Professor SIR EDWARD ELGAR. Mr. POOLER. FACULTY OF COMMERCE. Professor ASHLEY and Mr. KIRKALDY. Senor DE ARTEAGA. 20 York Place, Edinburgh. The COURSES of INSTRUCTION at the Institute's CENTRAL TECHNICAL COLLEGE (Exhibition Road) are for Students not under 16 years of age; those at the Institute's TECHNICAL COLLEGE, FINSBURY, for Students not under 14 years of age. The Entrance Examinations to both Colleges are held in September. Particulars of the Entrance Examinations, Scholarships, Fees, and Courses of Study, may be obtained from the respective Colleges, or from the Head Office of the Institute, Gresham College, Basinghall Street, E.C. CITY AND GUILDS CENTRAL TECHNICAL COLLEGE. A College for higher Technical Instruction for Day Students not under 16 preparing to become Civil, Mechanical, or Electrical Engineers, Chemical and other Manufacturers, and Teachers. The College is a School of the University of London in the Faculty of Engineering, Fee for a full Associateship Course, £30 per Session. Professors : Civil and Mechanical Engineering Electrical Engineering Chemistry Mechanics and Mathematics { W. E. DALBY, M.A., B.Sc., JW. E. AVRTON, F.R.S., Past Pres. H. E. ARMSTRONG, Ph.D., LL.D., O. HENRICI, Ph.D., LL.D., F.R.S. CITY AND GUILDS TECHNICAL COLLEGE, FINSBURY. (LEONARD STREET, CITY ROAD, E.C.) A College for Day Students not under 14, preparing to enter Engineering and Chemical Industries, and for Evening Students. Fees, £15 per Session for Day Students. Professors: Physics and Electrical Engineering Mechanical Engineering Chemistry S. P. THOMPSON, D.Sc., F.R.S., Principal of the College, and (E. G. COKER, M.A.. D.Sc.. M. Inst. M.E. R. MELDOLA, F.R.S., F.I.C. CLERKENWELL, LONDON, E.C. ENGINEERING DAY COURSES IN MECHANICAL, ELECTRICAL, AND HOROLOGICAL ENGINEERING. FULL DAY COURSES in the THEORY and PRACTICE of the above subjects will commence on MONDAY, OCTOBER 2, 1903 ENTRANCE EXAMINATION on WEDNESDAY and THURSDAY, SEPTEMBER 27 and 28. The Courses for Mechanical and Electrical Engineering include periods spent in Commercial Workshops, and extend over four years. They also prepare for the degree of B.Sc. in Engineering at the University of London. Fees for either of these Courses, £15 or £11 per annum. Three Entrance Scholarships of the value of £52 each, giving free tuition for the full course in Mechanical or Electrical Engineering, will be offered for competition at the Entrance Examination in September next. Conditions can be obtained from the PRINCIPAL. Full particulars as to fees, dates, &c., and all information respecting the work of the Institute, can be obtained at the Institute or on appli cation to R. MULLINEUX WALMSLEY, D.Sc., Principal. For other Scholastic Advertisements, see pages cxli and cxliv, THE DAVY-FARADAY RESEARCH LABORATORY OF THE ROYAL INSTITUTION. DIRECTOR: Professor Sir JAMES DEWAR, M. A., LL. D., D.Sc., F.R.S. SUPERINTENDENT OF THE LABORATORY: DR. ALEXANDER SCOTT, M.A., D.Sc., F.R.S. This Laboratory was founded by Dr. Ludwig Mond, F.R. S., as a Memorial of Davy and Faraday, for the purpose of promoting, by original research, the development and extension of Chemical and Physical Science. Michaelmas Term.-Monday, October 2, to Saturday, December 16. Full Information and Forms of Application can be had from the ASSISTANT SECRETARY, Royal Institution, Albemarle Street, W. To SCIENCE and MATHL. MASTERS.REQUIRED (1) Mathematical and Science Master for Higher Grade School in Scotland. £150, non-res. (2) Theoretical and Practical Science with other Subjects. 150, non-res., to commence. Secondary School near London. (3) Science and Form Work. 130, non-res. (4) Practical Physics and Maths. 100, resident.-For particulars of the above and many other vacancies, address GRIFFITHS, SMITH, POWELL AND SMITH, Tutorial Agents, 34 Bedford Street, Strand. London. For other Scholastic Advertisements, see pages cxl and cxliv, also page ii of Supplement. BROWNING'S PLATYSCOPIC LENS. WITH LARGER ANGLES, INCREASED FIELD, AND CO Engraved Real Size. AN ACHROMATIC COMBINATION. COMBINING THE DEFINITION OF A MICROSCOPE WITH THE PORTABILITY OF A POCKET LENS. "If you carry a small Platyscopic Pocket Lens (which every observer of Nature ought to do)."-GRANT ALLEN, in Knowledge. "I have long carried one of these instruments and found it invaluable."-JOHN T. CARRINGTON, Editor of Science Gossip. The Platyscopic Lens is invaluable to botanists, mineralogists, or entomologists, as it focuses about three times as far from the object as the Coddington Lens, and has a field unequalled for flatness, allowing opaque objects to be examined easily. It is made in four degrees of power, magnifying respectively 10, 15, 20, and 30 diams.; the lowest power, having the largest field, is the best adapted for general use. Mounted in Tortoiseshell, magnifying 10, 15, 20, or 30 diameters, either power.... In Nickelised German Silver, either power Combinations of any two powers, in Tortoiseshell Ditto Ditto in Nickelised German Silver ILLUSTRATED DESCRIPTION SENT FREE. JOHN S. d. 15 O 17 6 27 6 32 6 BROWNING, MANUFACTURING OPTICIAN, 78 STRAND, LONDON, W.C. THE JUBILEE ISSUED TO MARK THE FIFTY YEARS' EXISTENCE OF THE FIRM OF E. LEYBOLD'S NACHFOLGER, COLOGNE, Contains on its more than 900 pages a complete survey of the apparatus used for instruction in Physics, as well as numerous practical instructions and about 3000 illustrations. NATURE says:-"The firm of Leybold Nachfolger in Cologne has recently issued a very complete and interesting catalogue of physical apparatus and fittings sold by them. The book starts with a history of the instruments made in Cologne during the last century. In its second section we find an account of the construction and fittings of various chemical and physical institutions. After this follows the catalogue proper, filling some 800 large pages, profusely illustrated and admirably arranged. The book will be most useful to the teacher." (No. 1846, Vol. 71.) PRICE 25. CONTENTS.-AUGUST. Valuable Presentation to the Library and Map Department. Liberia. By Sir Harry Johnston, G.C.M.G., K.C.B. (With six Illus trations and Map.) The Ruins of "Huanuco Viejo," or Old Huanuco, with Notes on an Expedition to the Upper Maranon. By Reginald Enock. (With 18 Illustrations and two Plates.) Moorcroft and Hearsey's Visit to Lake Mansarowar in 1812. By Colonel Notes on a Journey Through the Northern Peninsula of Newfoundland. Some Recent Improvements in Surveying Instruments. By E. A. Reeves, Reviews. JENA. Branches: LONDON: 29 Margaret St., Regent Street, W. Berlin, Frankfort o/M, Hamburg, Vienna, St. Petersburg. VAPOUR PRESSURE APPARATUS. A convenient modification of Regnault's classic form. The barometer tubes are of syphon form, and are completely enclosed in a brass water-bath with plate-glass inspection windows. Price complete (without Mercury), £5 : 5 : 0. WRITE FOR DESCRIPTIVE PAMPHLET. The Cambridge Scientific Instrument Co., Ltd., CAMBRIDGE, ENGLAND. |