WILLIAM WESLEY AND SON, AMPERE METERS AND VOLT METERS. Scientific Booksellers and Publishers, 28 ESSEX STREET, STRAND, LONDON. The following recently-published NATURAL HISTORY AND SCIENTIFIC BOOK CIRCULARS include a portion of their stock : So97-ICHTHYOLOGY; Reptilia and Amphibia; General Zoology including Ancient Works, Biographies, Classification, Darwinism Manuals, Periodicals, Transactions of Societies; Anatomy, Physiology and Embryology. Price 4d. Ne -ORNITHOLOGY; Local and British Ornithological Faunas; Foreign and Exotic Ornithological Faunas; Cage Birds and Poultry; Omithological Monographs; Periodicals and Systematic Works. MAMMALIA; including Cetacea, Sirenia, and Pinnipedia. FAUNAS AND GEOGRAPHY of Great Britain and Ireland, Continental Europe, Africa, America, Arctic Regions, Asia, AustralZOOLOGICAL VOYAGES. Over 1000 Works. Price 4d. W. WESLEY & SON, 28 Essex Street, Strand, London. HOW TO WORK WITH THE MICROSCOPE. 100 OUR MORALITY AND THE MORAL QUESTION. 2s. 6d. THE MICROSCOPE IN MEDICINE. 86 Plates. 215. ON LIFE AND ON VITAL ACTION. 5s. LIFE THEORIES AND RELIGIOUS THOUGHT. 5s. 6d. DISEASE GERMS. (Soiled Copies only.) 8s. 6d. London: J. & A. CHURCHILL. EYESIGHT AND SPECTACLES. Homeopathic Review, October 1, 1889:- Parents and those that reak from using spectacles should read an original book, 'IS BAD SIGHT THE INCREASE The School Board Chronicle, August 31, 1889:-" Valuable mation can be gleaned from its pages. The Morning Post, July 23, 1889:-"A considerable amount of sense in Mr. Fournet's arguments." ated by EYRE & SPOTTISWOODE, 196 pp., 15 Stamps, post free. Address 18 BENTINCK ST., MANCHESTER SQUARE, LONDON, W. PROPER GLASSES PRESCRIBED, 5s. By Author of the Above. Hours, 10 till 7. for the Cure of NERVOUS COMPLAINTS have received Testimonials from three Physicians to Her Majesty the Queen, and over Forty Members of the Royal College of Physicians of London. 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Sir CHARLES Locock, Bart., M.D., says :-"PULVERMACHER'S BELTS are very effective in neuralgia and rheumatic affections, and I have prescribed them largely in my practice for other similar maladies, paralysis, &c." For full Price List and Particulars see new Pamphlet, "GALVANISM: Nature's Chief Restorer of Impaired Vital Energy." Post free from PULVERMACHER'S GALVANIC ESTABLISHMENT. 194 REGENT STREET, LONDON, W. ESTABLIShed over FORTY YEARS. MINERALOGY AND GEOLOGY. SPECIAL AND TYPICAL COLLECTIONS FOR STUDENTS LECTURERS, AND MUSEUMS. EVERY REQUISITE FOR PRACTICAL WORK, CABINETS, CASES, APPARATUS OF ALL KINDS. The Largest Stock in England of Rocks, Rock-Sections, Minerals, Fossils. New Catalogues and Lists now ready, Free, of JAMES R. GREGORY, 88 CHARLOTTE STREET, FITZROY SQUARE, LONDON. J. T. CROCKETT, Maker of every description of Entomological Cabinets and Apparn Store- and Book-boxes, fitted with Camphor-cells: Setting Boards, or -Flat, &c. Cabinets of every description kept in stock. SPECIAL INSECT CABINETS, with Drawers fitted with Glass Tops and Bottoms to she F. H. BUTLER, M.A. Oxon., A.R.S Mines, &c., upper and under side without removing insect. Store-boxes specially mast S.W., NATURAL HISTORY AGENCY, 148 BROMPTON ROAD, LONDON, Near the British Natural History Museum. English and Foreign Rocks, Minerals, Fossils, Shells, and other Objects of Natural History. HAND SPECIMENS of ROCKS and ROCK-FORMING MINERALS, from 3d. each, especially selected for Private Study and Science Teaching. STUDENTS' CABINETS, 12 inches x 8 inches x 3 inches, with two Lifting Trays and Internal Fittings, containing 60 to 65 Examples of Minerals, Rocks, and Rock-Formers, Fossils to illustrate all Formations, or Recent Shells: 175. each. ROCK SECTIONS IN GREAT VARIETY. MICRO GLASS SLIDES and COVER SLIPS, Round or Square (best English make only), RACK BOXES, &c. APPARATUS for BLOWPIPE and other ANALYSIS. CABINETS for Minerals or Shells, or fitted with divisions for Eggs. Fretwork & Carving. Highest Award-Gold Medal for Tools & Patterns. Machines, Designs, Tools, Wood, Mirrors, for Continental Setting, highly recommended for Beetles. All best work. Lowest possible terms for cash. Prices on Application. Estimates supplied. Trade supplied. Established since 1847. Show Rooms-7A Prince's Street, Cavendish Square, W. (7 doors frum Oxford Circus. Factories-34 Ridinghouse Street, and Ogle Street, W. Excellent Copies of the actual, natural Handwriting, also of Drawings, Music, even of elaborate Sketches, Programmes, Plans (up to Double-Elephant size). Shorthand, an^ Type-Writing, are easily, quickly, and cheaply produced by the AUTOCOPYIST Very fluid ink, used with ordinary pen and paper. Auto-Circulars resemble written letters. Used at the House of Lords, &c. AUTOCOPYIST DEPT. (A.E. T.Co., Ld.), London Wall, London, and 52 Princess Street, Manchester. PERKEN, SON, & RAYMENT, OPTIMUS ESTABLISHED 1852. 99 HATTON GARDEN, CATALOGUE FREE. Discount for the Trade. ENLARGING APPARATUS. Patent Quick Acting Rack Adjustment. alth This Apparatus comprises superior Mahogany Body Lantern and Long Bellows Camera adjusted by Rack and Pinion. The Lantern is fitted with powerful Refulgent Lamp, with 3 wicks, giving brilliant illumination. Compound Condensers. If with Russian Iron instead of 5-in., no lens 6-in., no 6-in., and 7-in., no 7-in., with superior portrait lens... 173 6 8-in.. 9-in.. 256 O 290 0 580 0.12-in., 360 0...10-in., OPTIMUS 30% s. d. 75 0 102 6 87 6 Japanned Metal. 30s. " ... 115 3 110 0 137 9 160 0 London, E.C. OPTIMU 45 Russian Iron Body, Brass Sliding Tubes, 45s. Each Magic Lantern is efficient for Exhibitions. The Lens gives crisp definition, being a superior achromatic photographic combination, with rack and pinion. Compound Condenser of 4 in. diameter. Three-wick Refulgent Lamp, yielding a brilliantly illuminated 450 0 picture, Japanned Metal, complete in Box......£1 10 0 ... 250 O 285 0 Works in any Weather. Size giving 4 Sparks, £4 10s. SCHOOL APPARATUS, Approved by Science and Art Department. HARVEY & PEAK, 6 CHARING CROSS ROAD, W.C. THE ZOOLOGIST: A MONTHLY MAGAZINE OF NATURAL HISTORY. Third Series. Edited by J. E. HARTING, F.L.S., F.Z.S., member of the British Ornithologists' Union; contains Original Articles by well-known naturalists in every branch of zoology; tants of animals; arrival and departure of migratory birds; occurrence of rare birds: distribution and migration of British fresh-water fish; new or e marine fish; local aquaria; British reptiles; British land and fresh water mollusca, with remarks on the haunts and habits of the species; and her matters of general interest to those who delight in natural history Reports of the Linnean, Zoological, and Entomological Societies. Reviews of natural history books. Occasional translations from foreign zoological urnals of important and interesting articles in various branches of zoology. There are occasional woodcuts. SIMPKIN, MARSHALL, & CO., Stationers' Hall Court. 27695 28957 AND IS ISSUED Stout ALIMENTAL TONIC Waltham THE HALF GUINED BY BREWERY. ONLY Londons Bro STOCKWELL On the 1st of every Month, Price Sixpence. AN ILLUSTRATED JOURNAL OF BRITISH ENTOMOLOGY. With the Assistance of FREDERICK BOND, F.Z.S. EDWARD A. FITCH, F.L.S. RICHARD SOUTH. 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. WOODCUT ILLUSTRATIONS and occasional LITHOGRAPHED and CHROMOLITHOGRAPHED PLATES. SIMPKIN, MARSHALL, & CO., Stationers' Hall Court. THE "HANSA," Published since 1864 in Hamburg, is the only independent professional paper ia 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 125. 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. von FREEDEN, M.R., Hamburg, Alexander Street, 8. Fry's Pure Concentrated Cocoa This Choice Preparation of Cocoa is exceedingly soluble and easily digested, It makes a most Delightful Beverage for Breakfast or Supper. Lancet.-" Pure, and very Soluble." Medical Times." Eminently suitable for Invalids." Sir C. A. Cameron, M.D.-"I have never tasted Cocoa that President of Royal College of Surgeons, Ireland. I like so well." W. H. R. Stanley, M.D.-" It is the drink par excellence for Children." HALF A TEASPOONFUL IS SUFFICIENT TO MAKE A CUP OF MOST DELICIOUS COCOA. TO SECURE THIS ARTICLE ASK FOR "FRY'S PURE CONCENTRATED COCOA." FORTY PRIZE MEDALS AWARDED TO J. S. FRY & SONS, BRISTOL, LONDON, & SYDNEY. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 and 8 Bread Street Hill, Queen Victoria Street, in the City of London, and Published be MACMILLAN AND Co., at the Office, 29 and 30 Bedford Street, Covent Garden.-THURSDAY, January 2, 1890. FLAT WATCH Amongst several unsolicited Testimonials the two following have been received by the maker: THE OBSERVATORY, MELBOURNE, DEAR SIR,-The Watkin Aneroid (Signed) R. J. ELLERY. EDINBURGH, May 31, '89. DEAR SIR.-I have just returned from a six weeks' stay at the Ben Nevis Obervatory, and while there had an opportunity of testng the admirable qualities of your new "Watkin " Aneroid. The result has been most satisfactory, the extreme error noted being only about 1 of an inch. During my stay at the Observatory the Aneroid was frequently tested by taking it down 2000 feet and then comparing it The results obtained speak volumes for the high-class workmanship and great J J. HICKS, 8, 9, & 10 HATTON GARDEN, LONDON: The 'STAR' MICROSCOPE is a modern marvel at its low price. The lenses alone are worth the money."-British Medical Journal. BECK'S £2 2s. to £5 5s. NEW MODEL "STAR" MICROSCOPE BROWNING'S PLATYSCOPIC LENS. Engraved Real Size. A NEW 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 o Nature ought to do)."-GRANT ALLEN in Knowledge. The Platyscopic Lens is invaluable to botanists, mineralogists, or entmologists, as it focuses 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 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. The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. Price of the Platyscopic Lens, mounted in Tortoiseshell, magnifying either 10, 15, 20, or 30 diameters, 18s. 6d. each power. Illustrated description sent free. JOHN BROWNING, 63 STRAND, LONDON, W.C. NEGRETTI AND ZAMBRA'S OPERA, RACE, & FIELD GLASSES throughout in brass, neatly japanned, and is not only first-rate ia optical qualities, but is now a handsome, well-finished Instrument. R. & J. BECK, 68 Cornhill, London, E.C. Barometers, Microscopes, Telescopes, 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. |