CADBURY'S COCOA ABSOLUTELY PURE THEREFORE BEST. The late editor of the Sanitary Review, writing on "The Consumption of Cocoa," warns the public against the use of foreign cocoas containing alkali, and makes the following allusion to the firm of CADBURY BROTHERS:-"It is the aim and practice of this famous firm to send out cocoa absolutely pure, of the highest quality which art will permit." NO CHEMICALS USED. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 and 8 Bread Street Hill, Queen Victoria Street, in the City of London, and Published by MACMILLAN AND Co., at 29 Bedford Street, London, W.C., and 112 Fourth Avenue, New York.-THURSDAY, February 11, 1892. EDINBURGH, May 31, 1889. it down 2000 feet and then (Signed) R. C. MOSSMAN, To be obtained of all Opticians and Wholesale Houses. [PRICE 15 CENTS. [All Rights are Reserved. BROWNING'S SPECTROSCOPES. THE MINIATURE SPECTROSCOPE. This instrument will show many of Fraunhofer's lines, the bright lines of the metals and gases, and the absorption bands in coloured gases, crystals, or liquids. Price, with Plain Slit, 1 25. ; ditto, with Adjustable Slit in Morocco Case, 1 15s.; ditto, with Achromatic Lense, &c., &c., in Morocco Case, £2 6s. New Illustrated Catalogue of Spectroscopes, Post Free. JOHN BROWNING, 63 STRAND, LONDON, W.C. NEGRETTI & ZAMBRA'S SELF-REGISTERING THERMOMETERS. out in brass, neatly japanned, and is not only first-rate in optical qualities, but is now a handsome, well-finished Instrument. R. & J. BECK, 68 Cornhill, London, E.C. NEGRETTI & ZAMBRA'S ELECTRIC INDICATOR will ring a bell when the temperature in greenhouse falls below or exceeds the point at which injury would be caused to plants, &c. It also indicates the present temperature as an ordinary thermometer. The bell can be placed in the gardener's cottage, or at any other convenien spot. Price, including bell, battery, thermometer, and 50 feet of doub connecting wire, £1 10s. NEGRETTI & ZAMBRA, OPTICIANS AND SCIENTIFIC INSTRUMENT MAKERS TO THE QUEEN, N. and Z.'s Large Illustrated Catalogue, 1200 Engravings. Price 5s. 6d. GOVERNMENT GRANT OF £4000 FOR THE PROMOTION OF SCIENTIFIC RESEARCH.-FEBRUARY 29 is the Last Day for receiving Applications. Forms may be obtained of the ASSISTANT SECRETARY, Royal Society, Burlington House, London. Reports on previous Grants due MARCH 1. EVENING LECTURES TO WORKING MEN. ROYAL COLLEGE OF SCIENCE, LONDON. The Third Course, consisting of Five Lectures on "Recent Chemical Discoveries," by W. P. WYNNE, Esq., B.Sc., Assistant Professor of Chemistry, Royal College of Science, will be delivered at the MUSEUM of PRACTICAL GEOLOGY in Jermyn Street, S. W.. on successive Monday evenings, at 8 o'Clock, commencing on FEBRUARY 29. Tickets may be obtained, by Working Men only, on Application at the Museum, on Monday Evening, February 22, from 6 to 10 o'clock. The SUMMER SESSION BEGINS ON MAY 1. The work is arranged so that a Student may advantageously begin the Science part of the Medical Curriculum then. Full information may be obtained from either of the undersigned. E. A. SCHÄFER, F.R.S., Dean of the Faculty. J. M. HORSBURGH, M.A., Secretary. BEDFORD COLLEGE, LONDON 8 and 9 YORK PLACE, BAKER STREET, W. The HALF-TERM will begin on THURSDAY, FEBRUARY 18. A Special Course for the Study of Historical German Grammar and Middle High German (suitable for B.A. [honours] and M. A. London) will begin on SATURDAY, FEBRUARY 20. PRINCE KROPOTKINE.-On MONDAY, FEBRUARY 29, at 4 p.m., at the PORTMAN ROOMS (32 DORSET STREET, BAKER STREET, W.), Prince KROPOTKINE will LECTURE on "Mutual Aid and the Struggle for Life." Dr. ROMANES in the Chair. Reserved Seats, 2s. 6d. Tickets on application to Messrs. MITCHELL & CO., Old Bond Street; or to T. J. COBDENSANDERSON, Hendon, N.W. Doors open at 3.30 p.m. A LADY, First-class in Honours in the Natural Sciences Tripos, Cambridge, late Scholar of Newnham College, and Specialist in Chemistry and Physics, Coaches for Examination in the above subjects.-Address, " E.," 18 Chenies Street Chambers, W.C. Living Organisms for the Microscope. Bursaria truncatella, Asplanchnopus, Synchæta, Conochilus, Stephanoceros, Melicerta, and other Pond Life. Is. per Tube. Aquaria stocked with Pond Life. Moderate Charges.-J. HooD, F.R. M.S., 50 Dallfield Walk, Dundee. Sale by Auction. MONDAY, FEBRUARY 29. THE FORBES COLLECTION OF STUFFED AND MOUNTED BIRDS, FISH, AND ANIMALS, CURIOSITIES, ETC. MR. J. C. STEVENS has received instruc tions from the Executors of the late J. FORBES, Esq., of Chertsey Bridge House. Chertsey, to sell by Auction at his Great Rooms, 38 King Street, Covent Garden, on MONDAY. FEBRUARY 29, at half-past 12 precisely, without reserve, his Valuable Collection of British and Foreign Birds, Fish, and Animals, beautifully set up in Oval-fronted Cases, by Cooper and others. Also his choice Collection of Native Weapons, Swords, and Curiosities. On view the Saturday prior, from 10 till 4. and Morning of Sale, and Catalogues had. LIVING SPECIMENS FOR THE MICROSCOPE. Attractive Specimens of Pond-life for Exhibition purposes, such as Volvox globator, Epistylis grandis, Hydraviridis, Melicerta tubicolaria, Lophopus crystallinus, "Phantom" larva (Corethra), Water-fleas, &c.; Amoeba Actinosphærium, Vorticella, Hydra, &c., for the Student of Biology. 15. per Tube each, Post-free. THOMAS E. BOLTON (Son and Successor of the late THOMAS BOLTON, F. R.M.S., to whom was awarded a Gold Medal at the Fisheries Exhibition, 1883), FARLEY ROAD, MALVERN. RECENT SHELLS. Marine, Land, and Freshwater Shells from all Parts of the World. SELECTIONS SENT ON APPROVAL. SPECIMENS EXCHANGED. COLLECTIONS PURCHASED. FOREIGN CORRESPONDENCE INVITED. HUGH FULTON, Dealer in Recent Shells, 89 FULHAM ROAD, LONDON, S.W. COLLECTIONS OF MINERALS, ROCKS, OR FOSSILS, For the Use of Students, Science Teachers, Prospectors, &c., and to illustrate the leading Text-books, in Boxes, with Trays. 50 Specimens, 10s. 6d. ; 100 do., 21s.; 200 do., 42s. New Price List of Minerals, Rocks, and Stratigraphical Series of Fossils ROCK SECTIONS for the MICROSCOPE from 1s. 6d. each, Post Free. CATALOGUES GRATIS. Post Free. CABINETS, GLASS-CAPPED BOXES, TRAYS, HAMMERS, &c.. always in Stock. THOMAS D. RUSSELL, 78 NEWGATE STREET, LONDON, E.C. NEWTON & CO., WIMSHURST SCIENTIFIC INSTRUMENT MACHINES. With Glass Plates, all sizes, double and multiple, also with Ebonite Cylinders with and without Glass Cases. Batteries, galvanic and medical. Telephones. Galvanometers, pocket, lecture-table, and laboratory. School Apparatus of every description. LARGE CATALOGUE, Fifth Edition, Royal 8vo, 144 PP., 700 Illustrations, Post free, 7d. KING, MENDHAM, & Co., Western Electrical Works, Bristol. ESTABLISHED 1876. TO SCIENCE LECTURERS. See Mr. HUGHES'S PATENT COMBINATION OPTICAL LAN- ! TERN, used by late W. LANT CARPENTER, Esq., Prof. FORBES. New Triple constructed for B. J. MALDEN, Esq., this season. New Oxyhydrogen Microscope. Grand Results. Docwra Triple, Prize Medal, Highest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN GUINNESS, Madame ADELINA PATTI, &c. Patent Pamphagos Lantern Science Lecture Sets. Novelties Cheapest and Rest. Elaborately Illustrated Catalogue, 300 Pages, 1S.; Postage, 5d. Smaller do., 6d. Pamphlets Free.-HUGHES, Specialist, Brewster House, Mortimer Road, Kingsland, N. MAKERS TO HER MAJESTY THE QUEEN. H. R.H. THE PRINCE OF WALES, TO THE ROYAL INSTITUTION OF GREAT BRITAIN, AND PHILOSOPHICAL APPARATUS FOR Sound, Light, Heat, Magnetism, Electricity, Hydrostatics, Lime Light and Electric Lanterns, Projecting Microscopes, New Catalogue, including List of Lantern Slides, 4d. OPTICAL PROJECTION. BY LEWIS WRIGHT. Second Edition. A Complete Guide to the Use of the Magic Lantern, the Lantern Microscope and Polariscope, and to the Projection of Scientific Experiments. Just Published by Longmans, 6s., net 45. 6d., Post free, 45. 10d. NEWTON & CO., 3 FLEET STREET, LONDON. FROM THE NORTH POLE TO 10° OF SOUTH DECLINATION. BY OTTO BOEDDICKER. *.* The Plates were Lithographed by Mr. W. H. WESLEY, Assistant Secretary of the Royal Astronomical Society. They are accompanied by a Preface which indicates the relation of the Drawings to the actual appearance of the Galaxy, as well as that of the Lithographs to the Originals. LONDON: LONGMANS, GREEN, & CO. WILLIAM WESLEY 28 ESSEX STREET, STRAND, LONDON, & SON HAVE ALWAYS ON HAND A LARGE STOCK OF ENGLISH AND FOREIGN BOOKS NATURAL HISTORY AND SCIENCE. MOIGNO.-Leçons de Calcul Différentiel et de Calcul Intégral. 2 Vols., Half-Calf. 1840-44. 18s. Calf. 1721. 7s. 6d. LEGENDRE.-Elements of Geometry and Trigonometry. All from the Library of the late Bishop HARVEY GOODWIN. BOTANICAL CATALOGUE, Part VIII. PURCHASERS of Self-RECORDING No. 112. METALLURGY, MINING, ENGINEERING. 500 Works. No. 113. MINERALOGY, CRYSTALLOGRAPHY, &c. No 114. ASTRONOMY. 2000 Works. Price 6d. 500 Works. ENGLISH TRANSLATION OF MENDELÉEFF'S CHEMISTRY. The Principles of Chemistry. By D. MENDELÉ eff, Professor of Chemistry in the University of St. Petersburg. TRANSLATED BY GEORGE KAMENSKY, A.R.S.M., of the Imperial Mint, St. Petersburg The Solar Revolution-The Relation to Motion-The Origin of TRANSIT INSTRUMENTS. CLARK'S PATENT TRANSIT INSTRUMENTS may be obtained as usual. A. J. FROST, II Victoria Street, Westminster. Price, £9 17s. 6d. STANLEY Mathematical Instrument Manufacturer to H.M. Government. Council of Mathematical, Drawing, and Surveying Instruments Of the Highest Quality and Finish, at the most Moderate Prices. Illustrated Price List Post Free. W. F. S. obtained the only Medal in the Great Exhibition of 1862 for Excellence of Construction of Mathematical Instruments, and the only GOLD MEDAL in the International Inventions Exhibition 1885 for Mathematical Work. Silver Medal, Architects' Exhibition, 1886. Address:-GREAT TURNSTILE, HOLBORN, LONDON, W.C. MESSRS. LONGMANS AND CO.'S LIST. To be published in 3 Vols. 8vo, 42s. each. Vols. I. and II. now ready. Vol. III. in the Spring. A DICTIONARY OF APPLIED CHEMISTRY. By T. E. THORPE, B.Sc. (Vict.), Ph.D., F. R. S., Treas. C. S., Professor of Chemistry in the Royal College of Science, London. Assisted by Eminent Contributors. To be Published in 4 Vols. 8vo. Vols. I. and II., Price 42s. each, now ready. Vol. III. in Preparation. WATTS' DICTIONARY OF CHEMISTRY. Revised and entirely Rewritten by H. FORSTER MORLEY, M.A., D.Sc., Fellow of, and lately Assistant Professor of Chemistry in, University College, London; and M. M. PATTISON MUIR, M.A., F. R.S.E., Fellow, and Prælector in Chemistry, of Gonville and Caius College, Cambridge. Assisted by Eminent Contributors. Thirteenth Edition, Revised and Enlarged, with 9 Coloured Plates and Maps and 987 Woodcuts. Crown 8vo, 155. GANOT'S ELEMENTARY TREATISE ON PHYSICS. EXPERIMENTAL AND APPLIED. Translated and Edited from GANOT'S " Éléments de Physique," by E. ATKINSON, Ph.D., F.C.S. Seventh Edition, with 37 Pages of New Matter, 7 Plates, 569 Woodcuts, and an Appendix of Questions. Crown 8vo, 7s. 6d. GANOT'S NATURAL PHILOSOPHY For General Readers and Young People. Translated and Edited from GANOT's "Cours Élémentaire de Physique," by E. ATKINSON, Ph.D., F.C.S. THE PRINCIPLES OF CHEMISTRY. By LESSONS IN ELEMENTARY MECHA D. MENDELEEFF, Professor of Chemistry in the University of St. OUTLINES OF THEORETICAL CHEMIS- SOLUTIONS. By W. OSTWALD, Professor of SELECT METHODS IN CHEMICAL ANA- CHEMICAL CALCULATIONS, with Explana tory Notes, Problems, and Answers. Specially adapted for use in Colleges and Science Schools. By R. LLOYD WHITELEY, F.I.C., Lecturer on Dyeing, and Assistant Lecturer and Demonstrator in Chemistry, in the University College, Nottingham. With a Preface by Prof. F. CLOWES, D.Sc. Lond., F.I.C. Crown 8vo, 25. [Just published. NICS. Designed for the Use of Schools, and of Candidates for the London A New Edition of this book, entirely rewritten, will be ready shortly ELEMENTS OF DYNAMICS (Kinetics and THE DYNAMICS OF ROTATION. By A. M. WORTHINGTON, M.A., Head Master of the Royal Naval AN INTRODUCTION TO DYNAMICS, in- OPTICAL PROJECTION: a Treatise on the Use of the Lantern in Exhibition and Scientific Demonstration. By PRINCIPLES OF GENERAL ORGANIC THE SYSTEM OF THE STARS. By AGNES CHEMISTRY. 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