Engraved Real Size. A NEW ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THE PORTABILITY OF A POCKET LENS. The Platyscopic Lens is invaluable to botanists, mineralogists, or entomologists, as it focusses about three times as far from the object as the Coddington Lenses. This allows opaque objects to be examined easily. The Platyscopic Lens is made of three degrees of power, magnifying respectively 15, 20, and 30 diams. ; the lowest power having the largest field, is the best adapted for general use. The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. Price of the Platyscopic Lens, mounted in Tortoiseshell, magnifying either 15, 20, or 30 diameters, £1 5. Illustrated description sent free. The New Pocket or Field Microscope, on Firm Folding Brass Tripod Stand, with fine Adjustment, I-inch Objective, Large Field Eye-piece, Hand-pliers, &c. ; height when set up, 10 inches; dimensions, packed in Morocco Case, 5 inches long. Price £1 11s. 6d. Or with 1-inch and 2-inch Objectives, Stage, Forceps, Stage Plate, and Dipping Tube, £2 25. List of Microscopes sent free. Illustrated Catalogue of Microscopes, with 35 Illustrations, 8 whole page Illustrations, sent for Six Stamps. JOHN BROWNING, OPTICAL AND PHYSICAL INSTRUMENT MAKER TO H.M. GOVERNMENT, THE ROYAL SOCIETY, THE ROYAL OBSERVATORIES OF GREENWICH AND EDINBURGH, &c., &c. 63, STRAND, W.C., LONDON. FACTORY-SOUTHAMPTON STREET AND EXETER STREET, LONDON. PRIZE MEDAL, 1862. Telescopes, Spectroscopes, Opera Glasses, &c., &c. ESTABLISHED 100 YEARS. MICROSCOPIC OBJECTS Of superlative perfection, illustrating Histology and every branch of Microscopy. Catalogue post free and gratis on application. PARIS UNIVERSAL EXHIBITION, 1878. Prize Medal awarded for Excellence, Variety, &c. EDMUND WHEELER, 48N, Tollington Road, Holloway, London, N. SUNDAY LECTURE SOCIETY.—LECTURES at ST. GEORGE'S HALL, Langham Place, each SUNDAY AFTERNOON, commencing at Four o'clock precisely. Sunday, January 19.-T. W. RHYS DAVIDS, Esq., on "Is Life Worth Having? and the Eternal Hope: an Answer from Buddha's First Sermon to some Questions of To-day."-Members' Annual Subscription, £1. Payment at the Door-One Penny, Sixpence, and (reserved seats) One Shilling. PRELIMINARY SCIENTIFIC EXAMINATION. A Class in all the subjects for this Examination is held at St. Bartholo mew's Hospital and College from January to July, commencing on January 20. BOTANY.-Rev. G. Henslow, M.A. (Christ's Col., Camb.), Lecturer on PHYSICS.-D. McAlister, B.A., B.Sc., (Lond.) (Fellow of St. John's Col., CHEMISTRY.-H. E. Armstrong, Ph.D., F.R.S., Demonstrator of Chemistry to the Hospital. The Class is open to others than Students of the Hospital. Fee for the entire Course (including practical instruction and materials)--To Students of the Hospital, £8 8s.; to others, £10 105. For particulars, application may be made personally or by letter to the Warden of the College, St. Bartholomew's Hospital, E C. MATRICULATION.-LONDON Six months' Course. Fee, £10 105. IST BACHELOR OF SCIENCE and PRELIMINARY SCIENTIFIC M.B. Six months' Course. Fee, £10 IOS. The above Classes will commence at the Royal Polytechnic, Regent Street, in January next, under the direction of Edward B. Aveling. D. Sc., F.L.S. All work practical. LIBRARY OF HARVARD UNIVERSITY, CAMBRIDGE, MASS., U.S.A. Packages for the General Library, or for any of the Departmental Libraries (Astronomical Observatory, Botanic Garden, Bussey Institution, Divinity School, Law School, Museum of Comparative Zoology, Scientific School), may be sent to the Agents, Messrs. TRUBNER & Co., 57 and 59, Ludgate Hill, London. JUSTIN WINSOR, Librarian. TURER has some time disengaged. His pupils have repeatedly taken the first place at the Military and other Examinations.-Address F.G.S., No. 1, Brunswick Villas, Woolwich. FOR SALE, a VALUABLE COLLECTION of Falkland Island Hawks, Buzzards, &c; also a King Penguin, Tierra del Fuegian Horned Owl, King Shags and Petrels, set up by Gardner, 371, Oxford Street.-Address Rev. H. C. L., care of Mrs. Hunt, Newborough, Wimborne. EVERETT'S SHORTHAND.-The System of Shorthand recently published by Prof. Everett was laid before the three London Shorthand Societies at a united meeting on January 2, and was very favourably received, several speakers expressing their opinion that it was the best system for a beginner to take up. afterwards subjected to some severe tests for precision in the expeditious writing and difficult passages, and passed them in a manner that gave complete satisfaction. It was "Everett's Shorthand," price 2s. 6d., is published by MARCUS WARD & Co., 67 and 68, Chandes Street, London, W.C. MICROSCOPE.-SMITH & BECK'S No. 1 large BINOCULAR MICROSCOPE, with coarse and fine adjustments for focussing, mechanical stage with rotating movement, having rectangular motion, mechanical sub-stage for holding and adjusting illuminating and polarising apparatus, diaphragm plate, plain and concave mirrors, and Wenham's binocular arrangement; double-jointed mirror; a separate tube for using as a monocular instrument; large condensing lens on stand; five eye-pieces; achromatic condenser; complete polarising apparatus; side condenser; Lister's dark wells and holder; double nose-piece; camera lucida; live-box; glass trough; tw glass plates with ledge; stage forceps; large forceps; erecting glass; luberkubn; 1-8, 15, 4-10, 2-3, 14 achromatic object-glasses; 107 objects; all packed in mahogany case complete. May be seen between 10 and 12 A.M., at 17, Store Street, Bedford Square, W. C. LIVING SPECIMENS FOR THE MICROSCOPE. THOMAS BOLTON, MICROSCOPIST'S and NATURALIST'S STUDIO, 17, ANN STREET BIRMINGHAM. RAPHIDIOPHRYS PALLIDA, The Freshwater Rhixopoda of F. Schulze figured in Archiv für mikroskop. Anatomie, vol. x. Plate xxvi. fig. 1. An interesting marine organism which Prof. E. Ray Lankester has recog nised as an embryo of the Polyzoa, Alcyonidium. Also Floscules, some fine Melicerta ringens, and Volvox globator, &c. Price List of Specimens on Application, with Stamped Addressed Envelope. Weekly Announcements will be made in this place of Organisms ready for sale. ELECTRICAL & SCIENTIFIC APPARATUS for AMATEURS and the TRADE.-Microphones of every form, from 15. 6d. New cheap Electric Lamps and Batteries. Induction Coils and Frictional Machines are specialties. Electrical Bells, Fire and Thief Alarms, and Automatic Switch-boards. Magnets, Covered Wires, Screws, and all Materials. Apparatus for Science Teachers. Illustrated Catalogue, one stamp. Repairs and Alterations. Appara. tus made to sketch.-DALE & CRAMPTON, Manufacturing Electricians, 4, Little Britain, E.C. Kew Observatory, December 13, 1878. Scale of Charges for Verification, &c., post free on application. WITHERNDEN SCHOOL, CATERHAM VALLEY, SURREY.-Principal, Mr. C. H. LAKE, B.A. Lond. (in Honours). Education on Natural Principles. A limited number of Pupils. ROYAL POLYTECHNIC.-CLASSES for the preparation of Students for University Examinations, under the direction of EDWARD B. AVELING, D.Sc., F. L.S. London University Matriculation, 1st and 2nd B.Sc., Preliminary Scientific M. B., Botany, Physiology, Chemistry. All the work practical. DUNHEVED COLLEGE (LIMITED), LAUNCESTON, CORNWALL. Seven hours from London. SEPARATE BEDROOMS. Systematic Teaching in SCIENCE, FOREIGN LANGUAGES, and UNIVERSITY Courses. Calendar post free from THE PRINCIPAL-BENJAMIN RALPH, LL.B. Dub. ENGRAVINGS AND ELECTROTYPES FOR SALE, at prices ranging from 1s. to 10s., in good condition, ready for printing. Small, medium size, and large engravings, comprising a great variety of subjects, suitable for Publishers, Advertisers, and Amateurs. Specimen of any subject required sent post free on application. FACSIMILE OF SIGNATURE for 35. An exact copy of any name guaranteed. These signatures being engraved in bold relief, are useful for Stamping Books, Circulars, and Documents, or Marking Linen, and made type-high for ordinary Letterpress Printing. Sent post free to any address on receipt of 36 stamps. BFranklin Nash 75, FLEET STREET, LONDON, E.C. ARTISTIC.-To Ladies and Gentlemen with some leisure time, desiring to supplement their incomes, an opportunity is offered of acquiring the ART of DRAWING and ENGRAVING on WOOD in a thoroughly satisfactory and perfect style. The terms are moderate, and the hours can be made to suit the convenience of pupils. Persons residing in the country can receive full instruction by correspondence. For further particulars call or address Mr. J. FRANKLIN NASH, Artist and Engraver, 75, Fleet Street, London, E.C. SHEPPEY FOSSILS. W. H. SHRUBSOLE, SHERRNESS-ON-SEA, respectfully intimates that the appeal recently made by him has been so heartily responded to, that he cannot receive any more orders for "extra selected "specimens at present. Orders for 10s. Collections of 100 "good" specimens can be executed without delay. "NOTES ON THE GEOLOGY OF SHEPPEY" post free on application. GEOLOGY.-In the Preface to the Student's ELEMENTS of GEOLOGY, by Sir Charles Lyell, price 9s., he says: -"As it is impossible to enable the reader to recognise rocks and minerals at sight by aid of verbal descriptions or figures, he will do well to obtain a well arranged collection of specimens, such as may be procured from Mr. TENNANT (149, Strand), Teacher of Mineralogy at King's College, London." These Collections are supplied on the following terms, in plain Mahogany Cabinets: 100 Specimens, in Cabinet, with 3 Trays 300 Specimens, in Cabinet, with 9 Drawers £2 2 07 5 5 ΤΟ ΙΟ 21 More extensive Collections at 50 to 5,000 Guineas each. SCIENTIFIC CHRISTMAS PRESENTS. Collections of FOSSILS, ROCKS, or MINERALS, arranged in Walnut stained and polished Cabinets with Lock and Key. Size of Specimens, 2 square inches. 100 Selected, 20s. 200 Selected, 40s. Catalogue free. No charge for packing. Carriage free to all parts of Great Britain. "THE POPULAR SCIENTIFIC POCKET CABINET SERIES," (Second Edition.) On the Existence of a Head-Kidney in the Embryo Chick, and on Cer- Notes on some of the Reticularian Rhizopoda of the Challenger Expe- The Morphology and Systematic Position of the Spongida. By F. M. Flagellated Organisms in the Blood of Healthy Rats. By Timothy Richards Lewis, M.B. LA SEMAINE FRANÇAISE, a Journal in French for English Readers. Politics, Literature, Music, Science, Art, Varieties, Notes for general and family reading. LA SEMAINE FRANÇAISE appeals to all who wish to read good and varied and interesting French. It will represent every phase of the language as written or spoken in our own time, and contain nothing which may not be read by all. Gems, Minerals, Metals, Fossils, Rocks, Shells, &c., &c. 25 Specimens LA SEMAINE FRANÇAISE can be had of in Cabinet, 25. rod. carriage paid. FREDERICK BOND, F.Z.S. FREDERICK SMITH, F.L.S. EDWARD A. FITCH. J. JENNER WEIR, F.L.S. JOHN A. POWER, M.D. F. BUCHANAN WHITE, M.D. The Entomologist was founded for the purpose of diffusing information with regard to the science generally, and especially respecting Insects injurious to Farm or Garden; for Recording the Capture of Rarities; and for Figuring Varieties. Monthly Lists of Duplicates and Desiderata are published. Interesting articles on all branches of the science are promised by leading entomologists. Especial attention is given to the printing of the WOODCUT ILLUSTRATIONS, which are numerous. There are occasionally COLOURED PLATES. SIMPKIN, MARSHALL, and CO., Stationers' Hall Court. all Newsagents and at all the Bookstalls, price 4d.; or will be sent, post free, from the Office of the Paper, 37, Southampton Street, Covent Garden, London. s. d. 19 6 9 9 5 0 Persons finding any difficulty in procuring the paper through a Bookseller or Newsagent may obtain it by post from the Publisher. THOMAS SPANSWICK is the proper title for filling in Post Office Orders. Post Office Orders should be made payable at the King Street Money Order Office, and Cheques should be crossed London and County Bank. Address all Communications concerning the supply of the paper, or other business matters, to The Publisher of La Semaine Française, 37, Southampton Street, Strand, London, W.C. NORTH BRITISH AGRICULTURIST, Is the only Agricultural Journal in Scotland, and circulates extensively amongst landed proprietors, factors, farmers, farm-bailiffs, and others interested in the management of landed property throughout Scot.and and the Northern Counties of England. The AGRICULTURIST has also a very considerable circulation on the Continent of Europe, America, Australia, and the Colonies. The AGRICULTURIST is published every Wednesday afternoon in time for the evening mails, and contains Reports of all the principal British and Irish Markets of the week, besides telegraphic reports of those held on the day of publication. The Veterinary Department is edited by one of the leading Veterinarians in the country, and is invaluable to the breeder and feeder as a guide to the rearing of animals, and their treatment when labouring under disease. Full Reports are given of the Meetings of the Royal Agricultural Society of England, the Royal Agricultural Society of Ireland, the Highland and Agricultural Society of Scotland, the Scottish Chamber of Agriculture, and all the principal Agricultural Associations throughout Great Britain and Ireland. For Advertisers addressing themselves to Farmers a better medium does not exist. Price 3d. By post, 3d. Annual Subscription, payable in advance, 145. Post-Office Orders payable to Charles Anderson, Jun., Edinburgh. JUST READY, IN 8vo, PRICE 5s. STUDIES IN COMPARATIVE ANATOMY, NO. II. THE ANATOMY OF THE AFRICAN ELEPHANT. By L. C. MIALL, Professor of Biology in the Yorkshire College, AND F. GREENWOOD, Curator to the Leeds School of Medicine. MACMILLAN AND CO., LONDON. THE JOURNAL OF PHYSIOLOGY. Now ready, Vol. I., No. 6. EDITED (With the co-operation in England of Professors GAMGEE, RUTHERford, and SANDERSON; and in America of Professors H. P. BowDITCH, H. N. MARTIN, and H. C. WooD) by MICHAEL FOSTER, M.D., F.R.S.; E. G. CUTLER and E. H. BRADFORD.-Changes of the Globular Richness of Human Blood. V. C. VAUGHAN assisted by HARRIET V. BILLS.-Estimation of Lime in the CHARLES S. Roy.-On the Influences which Modify the Work of the List of Titles of Books and Papers of Physiological Interest published since the appearance of Nos. 4 and 5. MACMILLAN & CO., London, Cambridge, and New York. The ELEMENTS of EMBRYOLOGY. By PRACTICAL PHYSIOLOGY: an ELE- The MORPHOLOGY of the SKULL. By W. K. PARKER, F.R.S., Hunterian Professor, Royal College of Surgeons, and G. T. BETTANY, B.Sc., Lecturer on Botany in Guy's Hospital Medical School. Illustrated. Crown 8vo. 10s. 61. The OSTEOLOGY of the MAMMALIA: a Series of Lectures. By Prof. W. H. FLOWER, F.R.S., F.R.C.S. With numerous Illustrations. New Edition, Enlarged. Crown 8vo. 10s. 6d. MACMILLAN & CO., London. Extra fcap. 8vo, 3s. 6d. METALS and their CHIEF INDUSTRIAL APPLICATIONS. By C. 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N.B.-Communications, &c., should be sent to the Editors at the above address. AGRICULTURE JOURNAL AND FARMERS' CHRONICLE, Edited by JOHN ALGERNON CLARKE, Secretary to the Central Chamber of Agriculture, Devotes special attention to the discussions and proceedings of the Chamber of Agriculture of Great Britain (which now number upwards of 18,000 members), besides giving original papers on practical farming, and a mass of intelligence of particular value to the agriculturist. The London Corn, Seed, Hop, Cattle, and other Markets of Monday are specially reported in this Journal, which is despatched the same evening so as to ensure delivery to country subscribers by the first post on Tuesday morning. Price 3d., or prepaid, 15s. a year post free. Published by W. PICKERING, 21, Arundel Street, Strand, W.C. THE "HANSA," Published since 1864, in Hamburg, is the only independent professional paper in Germany, dedicated exclusively to Maritime Objects. Essays, Critiques, Reviews, Reports, Advertisements. Strict eye kept upon the development of Maritime Affairs in every respect. Every second Sunday one Number in 4to at least; frequent supplements and drawings. Subscription at any time; preceding numbers of the year furnished subsequently. Price 123. for twelve months. Advertisements 4d. a line, widely spread_by_this paper; considerable abatement for 3, 6, 12 months' insertion. Business Office: Aug. Meyer and Dieckmann, Hamburg, Alterwall, 28. Edited by W. v. FREEDEN, M.R., Hamburg, Alexander Street, 8. BY LIONEL S. BEALE. Professor of Medicine in King's College, and Physician to the Hospital. The MICROSCOPE in MEDICINE. Fourth Edition. 215. [Now ready On LIFE and on VITAL ACTION in HEALTH and DISEASE. 5s. [Ready. BIOPLASM. An Introduction to Physiology and Medicine. 6s. 6d. DISEASE GERMS, and on the TREATMENT of the FEVERISH STATE. 12s. 6d. KIDNEY DISEASES, URINARY DEPOSITS, and CAL- BRYCE-WRIGHT'S CATALOGUE. In apologising for the delay, the readers of NATURE are informed that this résumé is now ready for distribution. Price One Shilling. BRYCE-WRIGHT, 90, GREAT RUSSELL STREET, LONDON, W.C. Small ELECTRIC REGULATOR with Parabolic Reflector (Fig. 1). This Regulator will give a powerful and steady light, with from 10 to 20 ... ... Parabolic Reflector, extra In these Regulators both carbons are moved by the electricity of the battery employed (without the aid of clockwork); the light remains uniform JOHN BROWNING, 990 2 2 OPTICAL AND PHYSICAL INSTRUMENT MAKER TO H.M. GOVERNMENT, THE ROYAL SOCIETY, THE ROYAL OBSERVATORY OF GREENWICH, AND THE OBSERVATORIES OF KEW, CAMBRIDGE, MELBOURNE, THE U.S. NAVAL OBSERVATORY, CAMBRIDGE AND HARVARD UNIVERSITIES, HOBOKEN COLLEGE, &c., &c. 163, STRAND, W.C. FACTORY-SOUTHAMPTON STREET, LONDON, W.C. ESTABLISHED 100 YEARS. |