xii 



HARDWICKE'S SCIENCE-GOSSIP. 



I HI I RTVIITV 2 Gol< * Medals, Paris Universal Exhibition, 1889. 



A W A n llh 1 1 2 Diplomas of Honor for Microscopes and Microscopic Objects, Antwerp International Microscopical 

 XI II tWXVUV Exhibition, 1891. And 



—— 24 Gold and other Medals at the principal International Exhibitions of the world. 



MICROSCOPES. 



The Van Heurek Microscope. 



(REGISTERED.) 

 Designed specially by WATSON & SONS, to the 

 specification ot Dr. Van Heurek, of Antwerp, for his 

 delicate high.pdwer work and Photography. 

 THE 



Edinburgh Student's Microscope. 



Made in four forms, suitable for the Amateur, Student, 

 or Professor Price from £3 lOs. 



The Scientist's Microscope. 



A largest size Microscope with all latest improvements 

 and every convenience for work. 



MICROSCOPIC OBJECTS. 



Section through sori of Fern 

 Set of 24 Botanical Slides (comparative 

 anatomy) specially arranged for the use of 

 Students. (See page 29 of New Catalogue) 32 

 Oak Moth. Opaque. Very pretty . . 1 

 Desmid — Micrasterias . . . 1 



Drosera — New Slide, with insects captured 1 

 New Slide, with about 150 selected Diatoms 

 from Glingore, Jutland. (Exceptionally fine) 6 



s. d. 

 1 



s. d. 



Set of 24 choice selected Diatomacece (see 



page 16 of New Catalogue) . . . 35 



New Slides containing different Species of 



One Genus of Diatomacece. 



Pleurosigma, 50 Species . . . . 25 



Surirella, 100 „ . . > . 15 O 



Coscinodiscus, 100 ,, ■ . . . 7 6 ; 



Navicul.i, 100 .. . ■ • . 7 & 



Full Illustrated Catalogue of Microscopes and Apparatus, 

 JUST PUBLISHED.— NEW CLASSIFIED LIST OF MICROSCOPIC OBJECTS; 



Either of the above Catalogues sent post free on application to 



W. WATSON & SONS, Opticians to Her Majesty's Government, 



313, HIGH HOLBORN, LONDON, W.C., 

 [Established 1837.] AND 251, SWANSTON STREET, M ELBOU RN E, ' AUSTRALIA. 



NO BELLADONNA NEEDED. 



OCULIST'S APPARATUS, 



See "Engineering," July iS/h, 1890. 

 CURATIVE 



SPEGTAGLI 



FOB, UNEASY SIGHTS. 



MR. A B FOURNET 0*25*) 



18, Bentinck-St., Welbeck-St.,W. 



{HOURS 11 TILL 7.) 

 COTTSUXTATION FEE, 5s 



Spectacles, Sieel f™r s > 7/6 .1 



Morning Post— 1,1 Is bad sight - #f^$ 

 on the increase?' is answered by /',///// 

 A. Fournet with much common 



s^nse. 



Homoeopathic Review. — "If you 

 need to see better, yet shrink from 

 glasses, read A.Fournet's Philoso- 

 phy of Sight." 



(15 Stamps, from the Author.) 



Fournet's Refractometer. 



Shown before Royal Institution. 



BOOKS 



' BY 



DR. J. E. TAYLOR, F.L.S., 



Editor OF Science- Gossip. 



The Sagacity and Morality of Plants: 



A Sketch of the Life and Conduct of the Vegetable 

 Kingdom. With a Coloured Frontispiece and loo 

 Illustrations. Crown 8vo., cloth extra, "js. 6d. 



Our Common British Fossils, and Where 



to Find Them. With 331 Illustrations. Crown Svo.,. 

 cloth extra, "]s. 6</. 



The Playtime Naturalist. With 366 Illus- 

 trations. Crown 8vo., cloth extra, $s. 



London : CHATTO & WINDUS, 214, Piccadilly. 



GH -CLASS MAGIC LANTERNS 



AND 



DISSOLVING VIEW APPARATUS. 



AS SUPPLIED TO UNIVERSITIES, COLLEGES, &c. 



Tin "Ci M Lantern. 



A best quality Single Lantern with Superior 

 4^-inch Condensers and extra large front 

 Lenses giving fine definition and great illumin- 

 ation. Price complete, with jet in case, 



£15 : 15 : 



The entire front reverses for portability. 



ORDINARY LANTERNS 



From £2:2:0. 



THE PRINCLE-BEARO MINIATURE LANTERM 



From £6:6:0. 

 Illustrated Catalogues gratis, post-free. 



406, 457, STRAND; 54, C0RNH1LL, LONDON- 



CADBURY'S COCOA 



ABSOLUTELY PURE, therefore BEST. 



PRECAUTION. — Be careful to avoid highly-coloured Foreign preparations, sold as pure, which are 

 adulterated with alkali. This may be detected by the dark colour, and the scent when a tin is first opened. 



