XX 



HARDWICKE'S SCIENCE-GOSSIP. 



JUST READY. 



NEW ILLUSTRATED CATALOGUE OF MICROSCOPES. 



It contains a full description of the construction of our 



Microscopes. 



NEW PATTERN MICROSCOPES, including new form of the 



Van Heurck Microscope, New Portable Microscope, Histological Micro- 



NEW'OBJECTIVES. | NEW SUBSTAGE CONDENSER. 

 NEW MICROSCOPE LAMP. 



NEW PHOTO-MICROGRAPHIC APPARATUS for Students, 



the Laboratory, and Van Heurck s Vertical Camera. 



COMPLETE MICROSCOPICAL OUTFITS, &c, &c. 



The above Catalogue sent post free on application. 



MICROSCOPIC OBJECTS. 



Type Slide of Sponge Spicules, 100 different Species . . . 

 Type Slide of 12 Spines of Echini, with list of names . . . 

 Set of 24 specially-selected Specimens for use with the Micro- 



Polariscope, in case complete . . 

 Anatomy of Leaf, q pieces, complete on one slide . . . 

 Stinging Hairs on Leaf of Nettle 4 - . . . 

 Lung of Chimney Sweeper, showing deposit of Carbon . 



Head and Eyes of Spider . . - 



Set of 24 choice selected Diatomacea;. in case complete . 



Type Slide Diatomacea?, 100 forms from Richmond, Virginia, with 



list of names . . . . ' . . . ... 



Type Slide Diatomaceas, 100 forms from Nottingham, Maryland, 



with list of names - * . , 



Ovipositor and Lungs of Spider, on one slide 



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



[Established 1837.] AND 



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

 251, SWANSTON STREET, MELBOURNE, AUSTRALIA. 



X lir X nTVriT\ " < ^' -' d Medals, Paris Universal Exhibition, 1889. 



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

 /I II t\\\\JUV Exhibition, 1891. And 



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



Church of 



ngland 



FI R E 



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OF 



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NO BELLADONNA NEEDED. 



OCULIST'S , APPARATUS, 



See "ENGINEERING," July iBtn, 1890. 

 CURATIVE 



SPECTACLES 



A PATENT 



SILVER 

 MEDAL, 

 PARIS, 

 1889. 



FOB UNEASY SIGHTS. 



The 

 tvcntor, 



MR. A. FOURNET US**) 



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



(HOURS 11 TILL 7.) 

 CONSULTATION FEE, 5s. 



Spectacles, steH ?Z? es ' 7/6 



Morning Post. — " ' Is bad sight f f>f(£ 

 on the increase?' is answered by /////// W> 

 A. Fournet with much common l Jf/II////\k 

 sense." / 



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 Kef Tactometer. 



Shown be/ore Royal Institution. 



FOR SALE— SECOND HAND. 



VERY FINE 



ICROSCOPE 



Made for the late Dr. Leeson by SMITH (Smith and Beck). 



Trice ££&*y—Cost £120. 



Extra Large Mechanical Stage with 2£ inches of movement in one direc- 

 tion and 2 inches in the other; Revolving Top Plate; Secondary Stage with 

 Rack and Pinion for Focusing and Adjusting ; Illuminating Apparatus ; Mirror 

 Box with Plane and Concave Mirrors, 4 inches diameter, and Set Screw ; large 

 Abraham's Prism and Fitting. Single Body with Rackwork Coarse Adjust- 

 ment ; also Micrometer Fine Adjustment. Wenham Binocular Body 

 with Removable Prism and Rack and Pinion to Capped Eyepieces, &c, all 

 of recent and best construction, to Interchange with Single Body. Achromatic 

 Condenser with Stops, &c. ; large Polarizing Apparatus, Centering Eyepiece, 

 Eleven Eyepieces. 



Five Objectives from 2-inch to i-i2th Immersion, large Condensing 

 Lens on Stand, Silver Side Reflector, Four Compressoriums. Revolving; 

 Selenite Stage, and a number of other Apparatus in Drawers of Mahogany 

 Cabinet. 



Can be seen at 



J. H. STEWARD'S, OPTICIAN, 406, STRAND, LONDON. 



TWO MAGAZINES. 



THE IDLER. Edited by Jerome K. Jerome and Robert E. Barr. 



Profusely Illustrated. Sixpence Monthly ; or 8j. per year, post free. 



THE GENTLEMAN'S MAGAZINE. One Shilling Monthly, or 



14s. per year, post free. In addition to Articles upon Subjects in Literature, Science, and Art, " TABLE TALK " by Sylvanus 

 London: CHATTO & WINDUS, 214, PICCADILLY, W. 



Urban appears Monthly. 



CADBURYS COCOA 



ABSOLUTELY PURE, therefore BEST. 



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

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