BROWNING'S PLATYSCOPIC LENS. "If you carry a small Platyscopic Pocket Lens (which every observer of Nature ought to do)."-GEANT ALLEN in KNOWLEDGE. Engraved real size. A NEW ACHROMATIC COMBINATION. COMBINING THE DEFINITION OF A MICROSCOPE WITH THE PORTABILITY The Platyscopic Lens is invaluable to botanists, mineralogists, or entomologists, 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. INTERNATIONAL HEALTH EXHIBITION. GREAT SUCCESS. TWO GOLD, TWO SILVER, ONE BRONZE, MEDALS. P. A. AWARDED TO MAIGNEN, 32, ST. MARY-AT-HILL, EASTCHEAP, LONDON, for MAIGNEN'S PATENT FILTRE RAPIDE AND WATER-SOFTENING PROCESS. Prices and Particulars in Pamphlet, "Water, Preventable Disease, and Filtration," by P. A. MAIGNEN. PHOTOGRAPHIC APPARATUS For TOURISTS, BICYCLISTS, TRICYCLISTS, &c. &c. OVER 10,000 NOW SOLD. THE INSTANTOGRAPH... LE MERVEILLEUX, £1 1 0 1 11 6 220 £2 2 0 3 30 130 £3 3 0 THE INSTANTOGRAPH. 600 8 8 0 12 by 10 £5 5 0 7 10 0 10 10 0 SETS OF PLATES, DISHES, CHEMICALS, LAMP, &c., with full instructions, t, 6/6; 1, 12/-;, 20/-; 10 by 8, 25/-. SETS OF PRINTING MATERIALS, SENSITISED PAPER, PRINTING FRAME, DISHES, TONING and FIXING SOLUTION, and full instructiors, t, 5/-;, 10/6; t, 15/-; 10 by 8, 21/-. SENSITISED PAPER, 3 sheets, 2/6; 6, 4/6; 12, 6/6. DRY PLATES, t, 1/6; . 3/6;,7/-; 10 by 8, 11/- per doz. INSTANTANEOUS, t, 2/-; t, 4/-; +, 8/-; 10 by 8, 12/- per doz. Catalogue, 2 stamps. "How to be a Successful Amateur Photographer," by W. J. LANCASTER, F.C.S., &c. &c. 3 Stamps. J. LANCASTER & SON, Opticians, Birmingham. Printed and Published for the Proprietors by CHARLES WYMAN, at the Printing Office of Wyman & Sons, 74-76, Great Queen-street, CONTENTS:-Feminine Volubility-Growth of a Family-Ramble with a Hun...er-Philosophy of Clothing-Tricycles -Geometrical Chats-Life in Death-Thought and Language-First tar Lessons-Gossip-Reviews-Correspondence-Chess. KNOWLED MAGAZINE OF SCIENCE PLAINLY WORDED-EXACTLY DESCRIBED HIAMO CONDUCTED BY RICHARD A. VOL. VIII.-No. 193.] THE PUBLIC ARE INVITED TO VISIT (FREE) THE AUTOTYPE FINE ART GALLERY, 74, NEW OXFORD STREET, W.O. SPLENDID COPIES OF THE OLD MASTERS, AN ILLUSTRATED PAMPHLET, "Autotype in relation THE FIRST AND SECOND ISSUE OF AUTO- Practical Lessons PHOTOGRAPH purchaser of Stanley's Complete Sets of Apparatus. Customer's own portrait taken by the Camera and Lens he purchases, thereby enabling him to see what work it will do. Complete sets for Dry-plate process, 50s., 63s., 80s., £5. 10s., £7. 10s., and upwards. Machine-made CAMERAS, superior to hand make, manufactured at own works, suitable for export. HOTOGRAPHY MADE EASY." New "PE EW SHUTTER, giving most rapid or prolonged exposures. Entirely under control." Smallest made. MPROVED SENSITISED PAPER. NE Per sheet 1s., or ready cut, sufficient for 42 C.D.V., 15 Cabinets, or 10 half-plates, 1s. Id., post free. EW "RAPID" POSITIVE PAPER, for printing by artificial light, 50 pieces C.D.V., 1s. 2d.; 24 cabinets, 1s. 8d.; or whole sheet, 1s. 2d. post free. New Illustrated Price list post free 1 stamp. FRIDAY, JULY 10, 1885. [PRICE THREEPENCE. R gistered at the G.P.O as a Newspaper. MEMORY & SUCCESS. Hodder & Stoughton's List. WHA HAT IS IT THAT contributes greatly to success? A bad memory. Man? WHA WHAT IS IT THAT every one can obtain from PROFESSOR LOISETTE? A good memory-the Physiological Art of Never Forgetting-wholly unlike Mnemonics. Any book whatever mastered in one reading. Lost Memories restored. The worst made good, and the best better. Prospectus post free, giving opinions of Mr. RICHARD A. PROCTOR, Dr. ANDREW WILSON, and others who have studied the system. Great inducements to Correspondence Classes in all parts of the world. Also private instruction by post. Day and Evening Classes in "Never Forgetting," and for Cure of "Mind-Wandering." PROFESSOR LOISETTE, MORRELL'S PATENT EARTH SYSTEM. See "Knowledge," March 27, 1885. From Mr. MELLOR, Surveyor, Prestwich."Nothing can be more satisfactory than the Closets at work in my district, everything being so clean and tidy, and without the least smell." MORRELL'S SANITARY APPLIANCE CO., 4, St. Ann's Square, Manchester. A Prize of One Guinea, and two Prizes of Fifteen Sample copies of Art Designer," containing Nine THE BEST GUIDE TO THE BLACK FOREST. NEW AND CHEAPER EDITION, Price 6s., with 6 Maps and 31 Illustrations. THE BLACK FOREST: Its People and Legends. By L. G. SEGUIN, author of "Walks in Algiers," "Walks in Bavaria," &c. "We had great pleasure in recommending Miss Seguin's pleasant volume on Algiers, and this one on the Black Forest strikes us as being even more attractive. . . . One can hardly have a safer guide than Miss Seguin." -Saturday Review "Her book is a complete guide-book to the Forest, but rising far above the level of a guide book in the style and character of its treatment. It will be very useful to the traveller, but also very agreeable to the reader who has no intention of travelling." -Guardian. "We can only say that we have not recently taken up a book, the intelligence, thoroughness, and literary skill of which have so greatly fascinated us. From beginning to end it is charming."-British Quarterly Review. "The country is rich in legendary lore, which Miss Seguin has been indefatigable in employing. The book is a thoroughly good book."-Westminster Review. Now Ready, Forty-Second Thousand, 7s. 6d. NATURAL LAW IN THE SPIRITUAL WORLD. By Professor HENRY DRUMMOND, F.R.S.E., F.G.S. Now Ready, with Portrait, 6s. THOUGHTS AT FOURSCORE AND EARLIER: a Medley. By THOMAS COOPER, author of "The Purgatory of Suicides," &c. Fourth Edition, Crown 8vo., 7s. 6d. THE ORIGIN OF THE WORLD, ACCORDING TO REVELATION AND SCIENCE. By Sir J. W. DAWSON, LL D., F.R.S,, author of "The Story of the Earth and Man," &c. London: HODDER & STOUGHTON, 27, Paternoster Row. of riders: combining in the highest degree the essentials of Safety, Speed, and Comfort, together with many incidental advantages. All are invited to try the "Facile" on terms stated in descriptive pamphlet, which will be sent post free on application. SOLE MANUFACTURERS: ELLIS & CO., LIMITED, 47, FARRINGDON ROAD, LONDON, E.C. Watkins & Doncaster, NATURALISTS AND Manufacturers of Entomological Plain Ring Nets, wire or cane, including Stick, 18. 8d., 28., 28. 3d. Folding nets, 4s. 6d. Pocket Boxes, 6d., 9d., 18. Zinc Relaxing Boxes, 9d., 18., 1s. 6d,, Entomological Pins, 1s. per oz. Store Boxes, 28. 6d., 48., 58., 68. Setting Boards, flat or oval, from 6d. to 1s. 10d.. Setting Houses, 9s. 6d., 11s. 6d., 14s. 6d. Zinc Larva Boxes, 9d., 18., 18. 6d. Breeding Cage, 2s. 6d. 48., 5s., 78. 6d. Botanical Cases, japanned double tin, 18. 6d., 4s., 5s., 6s. Botanical Paper, from ls. 1d. to 28. 2d. per quire. Insect Cases, 3s. 6d. to 11s. Forceps for removing Insects, 28. per pair. Cabinet Cork, 7 by 3, best quality, 1s. 3d. per doz. Nested Willow-chip Boxes, 4 doz., 8d. Killing Bottles, ready for use, 1s., 18. 6d. Coleopterists' Bottles, 1s. 6d., 1s. 8d. Label Lists of British Macro-lepidoptera, 9d. Ditto of British Birds' Eggs, 3d., &c. PATENTEES AND SOLE MANUFACTURERSSTARLEY BROS., St. John's Works, Coventry. Makers to Her Majesty the Queen. ILLUSTRATED CATALOGUES FREE. THE COVENTRY CHAIR Coventry to Birmingham and back, 85 miles in 4 hours and 10 minutes, with Passenger, 12 stones' weight. Illustrated Price List, including "Meteor," "Rover," and "Sociable" Tricycle, Free on application. STARLEY & SUTTON, "METEOR" WORKS, WEST ORCHARD, COVENTRY. P.S.-A "Coventry Chair" can be sent on trial to any address (with a Man to drive and explain it) by expenses being paid. Terms on application. A LARGE STOCK OF INSECTS AND PATTERNS OF RATIONAL DRESS. BIRDS' EGGS. CABINETS.-Special Show Room. FOR PARTICULARS AND MEASUREMENT A LIST WILL BE SENT ON APPLICATION. Birds, Mammals, &c., Preserved and Mounted by First-class Workmen. 36, STRAND, LONDON, W.C. (Five doors from Charing Cross). SOUTH LONDON MACHINISTS' CO. "PARAGON," "ANTELOPE," and "FLYING SCUD" TRICYCLES; "NANCY LEE," and "NONSUCH" BICYCLES. THE CHAMPION SAFETY, £10. 10s. "Splendid machines."-Vide Daily News, Jan. 30. "PARAGON." Price £17. 10s. EASY Terms, or 10 per cent, discount for Cash. These Celebrated Machines, and those of any other make, new second-hand (400 in showrooms), are supplied, with LARGE DIS. COUNT for Cash with Order, or on EASY TERMS. TUITION IN RIDING FREE to purchasers, in spacious school (60 by 40 concrete floor). THE LARGEST BICYCLE AND TRICYCLE SHOW ROOMS IN THE CITY. ESTABLISHED 1872. (Please quote where you saw this advertisement.) Price 2s. 6d., Post Free To any Address in the United Kingdom. Under Garments as worn by the Lady Correspondent of "KNOWLEDGE" on this subject. Apply or Address W. MILES, Knowledge Office, 74, Great Queen Street, London, W.C. THE PATENT BOOK-SHELF FITTINGS, As used in the PUBLIC LIBRARIES of LIVERPOOL, GLASGOW, BIRMINGHAM, &c., enable a nice adjustment of Shelves to be made without trouble. Hookham's Patent PICTURE LINE & FASTENERS afford the MOST SECURE AND EASY means of hanging Pictures. a regular CURRALL'S PATENT VENTILATORS secure THE SCHOOL OF ELECTRICAL ENGINEERING AND SUBMARINE TELEGRAPHY. Established in 1868. 12, Princes Street, Hanover Square, London, W. Managers SW. N. TIDDY, M.S.T.E. WM. LANT CARPENTER, B.A., B.Sc., F.C.S. This Establishment is the Largest School of Electrical Engineering in the world, and embraces a greater range of subjects of instruction than any other. It is also the only one in which a lengthened experience of the difficulties of combining an effective course of tuition in the theoretical portions of the subject, with thorough practical training, has led to success in fitting men for every branch of Applied Electricity. In this respect it differs from the theoretical teaching of a University or College course on the one hand, and from the purely practical knowledge picked up by apprentices in the workshops of an electrical engineer on the other, by being more thorough than either, while combining the advantages of both. Since the opening of the School in 1868, upwards of 3,000 pupils have passed through it, many of whom now hold very high posts in Electrical Industry. NATURE OF THE TRAINING AND STUDIES. The PRACTICAL portion of the course includes tuition and daily practice in the various Systems of Telegraphy, and especially in SUBMARINE TELEGRAPHY, with the aid of very large artificial cables and a "Siphon-recorder;" as well as in the different TELEPHONIC Systems; also in the different Methods of ELECTRIC LIGHTING, including the management of Prime Motors, Accumulators, Arc and Incandescent Lamps, &c. An extensive and varied collection of apparatus, including several kinds of Dynamo Machines, is used for this. The THEORETICAL portion is embodied in Lectures, which are followed up by tutorial instruction both in classes and individually. The subjects treated of comprise those portions of Mathematics, Mechanics, Physics, and Chemistry which bear upon Electricity, and an exhaustive study of the theoretical principles of Electricity, a thorough comprehension of which is essential to the Scientific Electrician. ELECTRIC LIGHTING, TELEPHONE, AND SUBMARINE TELEGRAPH COMPANIES, ENGINEERS, AND OTHERS, SUPPLIED WITH EFFICIENT OFFICERS FOR EVERY DEPARTMENT OF APPLIED ELECTRICITY. ELECTRICAL TESTING DEPARTMENT. Inventors supplied with every facility and the use of all necessary Plant and Machinery for Testing or working out Electrical inventions and improvements of every description. The utmost secrecy guaranteed, and advice given as to the commercial value of new inventions. Private Rooms and High Professional Assistance if required. TESTS MADE AND REPORTS FURNISHED. For further particulars apply to the SECRETARY, 12, PRINCES ST., HANOVER SQUARE, LONDON, W. R. & J. BECK'S MORSON'S NEW Microscope. "THE STAR" PEPSINE As Wine in Bottles at 3s., 58., and 9s.; Lozenges PREPARATIONS OF PARATION Highly recommended by the Medical Profession for INDIGESTION. 2s. 6d. and 4s. 6d.; Globules, 28., 38. 6d., and 6s. 6d.; and Powder, as "Medicinal Pepsine," at 2s. 6d. and 48.; and "Porci," a more concentrated preparation than the Medicinal, at 48. 6d. each. SOLD BY ALL CHEMISTS. The popularity Pepsine has acquired as almost a specific for chronic dyspepsia, indigestion, &c., is due to the fact that it is the nearest possible production of the active principle of the gastric juice of the stomach. Unfortunately, like all other inventions of a like nature, Pepsine has been not slightly discredited the spurious manufactures that have been issued from time to time: it is therefore necessary as a guarantee of its efficacy to see that each bottle bears the maker's name, MORSON & SON, Southampton-row, Russell-square, LONDON. CAMERA LENSES. "ELECTRICITY IS LIFE." (TRADE MARK.) by G Seven First-Class International Awards. SWIFT & SON'S New Paragon Lenses (rapid and ordinary). These lenses for Portraits, Groups, Architecture, &c., are unsurpassed, and their depth of focus and beauty of detail are equal to any yet produced at Home or Abroad (prices moderate). Catalogue of Photographic Apparatus, &c., for stamp. UNIVERSITY OPTICAL WORKS, 81, TOTTENHAM COURT ROAD, LONDON, W. THE DEMONSTRATION MICROSCOPE. 3 Achromatic Powers of 30, 100, and 150 Diameters. "No praise we could bestow upon the instrument, M. THEILER & SONS, Makers, 86, CANONBURY ROAD, LONDON, N. THE Universal Pocket-Microscope With extra Botanical Lens, and 3 Prepared Slides. PRICE 6s. 6d. "No one having an interest in microscopy should leave home unaccompanied by such a small and so efficient an instrument."-See KNOWLEDGE, June 5, 1885. COLLECTION OF "I am satisfied that Mr. PULVERMACHER is an honest and earnest labourer in the field of science, and I think he deserves to meet with every encouragement from the profession and scientific men." GALVA ALVANISM v. NERVOUS DEBILITY. "Wesley Manse, Clevedon, Somerset, "June 1, 1885. "Gentlemen,-I have derived great benefit from the use of your Galvanic Appliances, and there is nothing I can so well rely on to restore the nervous energy as your Galvanie Belt.-Yours truly, "Rev. A. D. COPE, "Messrs. J. L. Pulvermacher & Co., 194, Regent-street, W. ALVANISM V. DEAFNESS AND WEAKNESS of LEG. "38, Bishop's-road, Victoria-park, E., "May 18, 1885. "Dear Sir,-My daughter lost her hearing through an accident, so that she could not even hear vehicles passing the street. She was advised to go to Soho-square to see a doctor, without result. I then purchased your 21s. Deafness Chain, and in a week the hearing was better, and in two months my daughter was cured. I cannot speak too highly of your treatment.-I remain, yours most respectfully, (Mrs.) H. THURSTON. "Mr. Pulvermacher, 194, Regent-street, W." ALVANISM v. INDIGESTION AND NERVOUS DEBILITY. GALVA "7, Musley-lane, Ware, Herts, May 5, 1895. Gentlemen,-"Your Galvanic Belt has re, stored life and vigour to 'my system, and has made life a pleasure to me. If you hear from any one from this part of the country refer them to me, and I hope to forward you an order for another Belt in a week or two for a friend. Yours very truly, "J. COLLINS, "J. L. Pulvermacher & Co., 194, Regentstreet, W." ESSRS. J. L. PULVERMACHER & CO., SPECTACLES 50 PREPARED SPECIMENS. MESS, the well-known Medical Galvanists, who OPHTHALMIC IRREGULARITIES. W. JOHNSON, Ophthalmic Optician, received the HIGHEST and ONLY AWARD granted for SPECTACLES IN LONDON, International Exhibition, 1862. Patronised by the most eminent oculists and medical men. W. JOHNSON, OPTICIAN TO THE UNIVERSITY HOSPITAL, 188, TOTTENHAM COURT ROAD. "Remarks on Spectacles," post-free. |