W. WATSON & SONS. Awarded 20 GOLD AND OTHER MEDALS at various International Exhibitions, including 2 GOLD MEDALS Paris Exhibition, 1890, for Microscopes, &c. NEW, RARE, AND INTERESTING MICROSCOPIC OBJECTS. New Slide, containing about 200 various Diatoms from St. Peter, Type Slide of about 60 Diatoms from Simbirsk Very beautiful Group of Eggs of Butterflies, Moths, &c.-Opaque s. d. 6 0 6 ... IO 6 18 6 I I I 9 Very fine Arranged Group of various Diatoms-suitable for Soirées, &c. Distillation from Vapour of Coke-for Polariscope 86 I о Trans. Section of Tentacle of Sea Anemone, showing Thread Cells, & Trans. Section of Ascaris from Horse, showing Alimentary Canal, Ovi ducts, Uterus. Muscle, &c. Amphioxus-Trans. Section through Pharynx Phantom Shrimp (Caprella linearis) Kidney of Snail-Typical Crustacean Sponge Spicules from Jeremie, in Group-very curious... Pediculus capitis, Male, Female, Egg, and Larva-on One Slide Any of the above forwarded on receipt of Remittance for Price. CLASSIFIED LIST OF 40,000 FIRST-CLASS OBJECTS forwarded Post free on application toW. WATSON & SONS, OPTICIANS TO HER MAJESTY'S GOVERNMENT, 313 HIGH HOLBORN, LONDON, W.C. AND 251 SWANSTON STREET, MELBOURNE, AUSTRALIA. A WORD TO BUSINESS MEN. You cannot afford to do your writing in the old way. The work of our machines is plain and business-like, obviating all mistakes in reading. Several copies can be made at one writing by the use of carbon paper. Excellent letterpress copies can be taken. Our improved machine has been adopted in all the Departments of the Government Service, and is being very generally introduced by all leading business houses. Does not this argue that the Typewriter should be worth something to you? The Machines can be furnished with special key-boards to suit any purchaser's line of business. HARVEY & PEAK, 6 CHARING CROSS ROAD, W.C. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 and 8 Bread Street Hill, Queen Victoria Street, in the City of London, and Publishe MACMILLAN AND Co., at the Office, 29 and 30 Bedford Street, Covent Garden.-THURSDAY, February 2, 1890. PHYSICAL, PHYSIOLOGICAL, BOTANICAL, AND Drawings made on Stone and Wood, and the most refined work in Lithography Sole Authorized Makers of PROF. EWING'S SEISMOMETRIC APPARATUS. Now Ready, Vol. XI., Nos. 1 and 2. Price to Subscribers 215. per Yearly Volume, post free. THE JOURNAL OF PHYSIOLOGY. NALDER BROS. & CO., TELEPHONE 3120. 132 HORSEFERRY ROAD, WESTMINSTER. TELEGRAPHIC ADDRESS: SECOHM, LONDON CATALOGUES ON APPLICATION. NEGRETTI AND ZAMBRA'S OPERA, RACE, & FIELD GLASSES OF EVERY DESCRIPTION. Barometers, Microscopes, Telescopes, Illustrated Price Lists posted free to all parts of the World. NEGRETTI & ZAMBRA, OPTICIANS AND SCIENTIFIC INSTRUMENT MAKERS TO THE QUEEN Branches: 45. CORNHILL; 122 REGENT STREET. N. & Z.'s Large Illustrated Catalogue, 1200 Engravings, Price 5s. 6d. THE COUNTY COUNCIL FOR THE COUNTY PALATINE OF LANCASTER. The Public Health Committee of the Lancashire County Council is prepared to receive Applications from duly qualified persons for the Appointment of MEDICAL OFFICER OF HEALTH for the Administrative County of Lancaster Salary £800 per annum, with a reasonable allowance for travelling expenses. The official will not be eligible for a pension, and the appointment is to be determinable by a 6 months' notice on either side. All applications, with testimonials, to be sent to me, the undersigned, before MARCH 22, 1890. County Offices, Preston. LIVING SPECIMENS FOR THE MICROSCOPE. GOLD MEDAL awarded at the FISHERIES EXHIBITION to THOMAS BOLTON, 83 CAMDEN STREET, BIRMINGHAM, Who last week sent to his subscribers Asterionella formosa, with sketch as description. He also sent out Argulus foliaceus, Corethra. Truu ha Philodina roseola, Floscularia, Corethra plumicornis, Melicerta rings Stephanoceros; also Amoeba, Hydra, Vorticella, Crayfish, Dog-Fr Amphioxus, and other Specimens for Biological Laboratory work. Weekly Announcements will be made in this place of organisms TE is supplying. Specimen Tube, One Shilling, post free. Twenty-six Tubes in Course of Six Months for Subscription of £1 11. or Twelve Tubes for 10s. 6d. Portfolio of Drawings, Eleven Parts, 1. each. F. H. BUTLER, M.A. Oxon., A.R.S. Mines, &c.. NATURAL HISTORY AGENCY, 148 BROMPTON ROAD, LONDON, S.W., Near the British Natural History Museum, Begs to give notice that at the end of MARCH next his Business WILL BE REMOVED to his lately acquired Commodious Show and ! Store Rooms at A FRENCH GENTLEMAN having studied THOMAS D. RUSSELL, at the N. H. Museum, Paris, desires situation in Biological Laboratory. Write to Mr. CHARPENTIER, Caversham, nr. Reading. TO SCIENCE LECTURERS. See Mr. HUGHES'S PATENT COMBINATION OPTICAL LANTERN, used by W. LANT CARPENTER, Esq., Prof. FORBES, B. J. MALDEN, Esq. New Oxyhydrogen Microscope. Grand Results. Docwra Triple, Prize Medal, Highest Award. Patent Pamphagos Lantern Science Lecture Sets. Novelties Cheapest and Best. Elaborately Illustrated Catalogue, 300 Pages, 1s.; Postage, 5d. Smaller do., 6d. Pamphlets Free. HUGHES, Specialist, Brewster House, Mortimer Road, Kingsland, N. PRIZE MEDALLIST, HEALTH EXHIBITION. 78 NEWGATE STREET, LONDON, EC ROCK SECTIONS CUTTING MACHINES Prize Medal awarded by the Jury of the late Exhibition of Inventions PRICE £5. Sole Makers CUTTELL, 47 Rathbone Place, Oxford Street. Sale by Auction. THE CELEBRATED PERCY MINERAES. MR. J. C. STEVENS has received Instructions from the Executors to SELL. BY AUCTION, at his Great Rooms, 38 King Street, Covent Garden, on MONDAY, MA CH 10, at half-past 13 precisely, without the least reserve, the Valuable and Wellauthenticated Collection of Minerals formed by the late Dr. JOHN PERCY, M.D., F.R.S., &c., Author of the World-renowned Works on Metallurgy. The Collection comprises Choice Silver and Gold Specimens, as well as of most Metalliferous Minerals; also Valuable Earthy Minerals, Polished Specimens in great Variety and Beauty. Most of the Examples have been re-examined, and Valuable Notes are appended to the Labels in the Handwriting of the late Doctor, thus increasing the Interest of the Collection. On View Saturday prior from 10 to 4, and Morning of Sale, and Catalogues had. On the 1st of every Month, Price Sixpence. THE ENTOMOLOGIST: AN ILLUSTRATED JOURNAL OF GENERAL ENTOMOLOGY T. R. BILLIPS, F.E.S. Contains Articles by well-known Entomologists on all branches of the Science; on Insects injurious or beneficial to Farm or Garden; Notes on Habits, Life Histories, Occurrence of Rarities, &c. There are Monthly Lists of Duplicates and Desiderata. WooncUT ILLUSTRATIONS and occasional LITHOGRAPHED and CHROMOLITHOGRAPHED PLATES. SIMPKIN, MARSHALL, HAMILTON, & KENT, LTD., Excellent Copies of the actual, natural Handwriting, also of Drawings, Music, even of elaborate Sketches, Programmes, I Plans (up to Double-Elephant size). Shorthand, and Type-Writing, are easily, quickly, and cheaply produced by the AUTOCOPYIST Very fluid ink, used with ordinary pen and paper. Auto-Circulars HOLLOWAY'S PILLS THIS MEDICINE Is unequalled in the Cure of all Disorders of the LIVER, STOMACH, KIDNEYS AND BOWELS. A Great PURI. FIER of the BLOOD; a Powerful Invigorator of the System, if suffering from WEAKNESS AND DEBILITY, and is unequalled in Complaints incidental to Females. MANUSCRIPT COPYING By Typewriter. Special attention given to Papers on Technical Subjects for Public Reading. Price, Is. 3d. per 1000 Words. Manifold Copies, 1s. per 1000 Words. STANDARD TYPEWRITING CO., 90 & 91 Queen St. (third floor), E.C. and at 38 Arlington Square, N., and 41 Goldney Road, W. OSTEOLOGICAL SPECIME NIS, MODELS, &c.-MOORE BROS., 49 Hardman Street, Liverpool. Price List, Three Stamps. Waltham Bros. Brewers. London.S.W WIMSHURST MACHINE. Works in any Weather. Size giving 4 Sparks, £4 10s. HARVEY & PEAK, 6 CHARING CROSS ROAD, W.C. PERKEN SON, & RAYMENT, MANUFACTURE PHOTOGRAPHIC APPARATUS Of every description. "OPTIMUS" PHOTOGRAPHIC SETS" OPTIMUS" MAGAZINE CAMERA" OPTIMUS" PHOTOGRAPHIC LENSES In Three Volumes, Price £2 2s. Each. Vol. I. Now Ready. 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 Normal School of Science and Royal School of Mines, South Kensington. LONDON LONGMANS, GREEN, & CO. Just Published, with 57 Illustrations and Diagrams, Crown 8vo, 48. 6d. THE ELEMENTS OF WILLIAM WESLEY AND Scientific Booksellers and Publishers, 28 ESSEX STREET, STRAND, LONDON. Just Published, Price 3d. A Classified Catalogue of NEW and SECOND-HAND WOKKS in ASTRONOMY, Just Published, in One Volume, Crown 8vo, Cloth, 136 Pages, 4 Folded Rainfall Tables, Wynberg, 1889, 2s. 6d. CYCLES OF DROUGHT AND GOOD SEASONS IN SOUTH AFRICA. By D. E. HUTCHINS, Conservator of Forests, Knysna. With Reprints of his Lectures on "Sunspots and Seasons," "Our Climate and its Variation in Cycles," but Re-written and Enlarged. W. WESLEY & SON, 28 Essex Street, Strand, London. BRADY & MARTIN, 27, 29, & 31 MOSLEY STREET, Wholesale and Export Dealers and Manufacturers of Chemical and Scientific Apparatus, Pure Chemicals for Analysis, &c., Supply Colleges and Schools in all parts of the World with every requisite for Theoretical and Experimental Work in Chemistry, Sound, Light, Heat, Magnetism, Electricity, &c. Analytical & Works Laboratories completely Furnished. Agents in connection with the Science and Art Department. LABORATORY WORK. A Course of Natural Science. BY A. G. EARL, M. A., F. C. S., Late Scholar of Christ's College, Cambridge; Science Master at Tonbridge School. With numerous Questions and Exercises. London: LONGMANS, GREEN, & CO. DIGEST OF MR. HERBERT SPENCER'S WORKS. Just Published, 8vo, Cloth, Price 155. AN EPITOME OF THE SYNTHETIC PHILOSOPHY. By F. HOWARD COLLINS. With a Preface by HERBERT SPENCER. "I have read portions taken at random here and there, and have found them very well done."-MR. SPENCER in Preface. WILLIAMS & NORGATE, London and Edinburgh. DEATH AND DISABLEMENT BY ACCIDENT. THE RAILWAY PASSENGERS' ASSURANCE COMPANY Assures 1000 at Death and Full Benefits at £4 per Annum. HON. EVELYN ASHLEY, Chairman. Annual Income £250,000. 80,000 ANNUAL POLICYHOLDERS. Invested Capital and Reserve Fund £285,000. £2,750,000. West End Office:-8 GRAND HOTEL BUILDINGS, W.c. Head Office:-64 CORNHILL, LONDON, E. C. WILLIAM J. VIAN, Secretary. STANLEY Mathematical Instrument Manufacturer to H.M. Government, Council of India, Science and Art Department, Admiralty, &c. Mathematical, Drawing, and Surveying Instruments of every Description, 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 1863 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. |