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International Exhibition Prize Medals and Awards, 1851, 1855, 1862, 1873, 1878 ; and 

 The Imperial Austrian Francis Joseph Order, for Excellence and Cheapness. 



M. PILLISCHER'S NEW MICROSCOPE, 

 "THE INTERNATIONAL," 



Is furnished with B and C Eye-pieces ; a 5-8 and 1-1 Object-glasses of high defining and penetrating quality, 

 combining (by a draw-tube) a series of eight different powers, from 50 to 420 diameters ; bull's-eye con- 

 denser ; revolving diaphragm ; pair of tweezers ; plate-glass sUps and thin covering glass, and a well-made 



mahogany box, 10 by 6 by 4, with lock and key Price £7 lOs. 



With the addition of A Eye-piece, H or 2 in. Object-glass, Polarisiag Apparatns and 



Selenito, and a Camera Lucida Price £10 lOs. 



And all the Apparatus and Accessories, as described above, with the addition of a 

 D Eye-piece and a 1-9 Object-glass, giving a series of twenty-eight magnifying 



powers, from 15 to 1000 diameters ■_ Price £14 Os. 



A Glass Stage, to prevent the instrument from being affected by the use of corrosive 



chemicals, to any of the above instruments, extra 123. 6d. 



Illustrated Descriptive Catalogue on application to 

 ss, 3srEj-w- BonsriD street, XiOiN^iDoisr, "v^r. 



MIGROSCOPIGAL SPECIALITIES, 



ILLTJSTEATING THE STKTJCTTTRE, GEOWTH, AND EEPRODTTCTION OF PLANTS. 



SPECIAL EDUCATIONAL SETS, illustrating Sachs' and Thome's Text-Books of 

 Botany, the preparations being copies of figures in those works. 

 A large assortment of miscellaneous Botanical Objects. Test Diatoms mounted in 

 Monobromide of Naphthaline. 



Clias. V. Smith, Cai'inairtlxeii. 



POWELL AND LEALAND'S 



NEW OIL IMMERSION CONDENSER 



can be adapted to any Microscope, and resolves all the most difficult test objects — price 



Two Guineas. 



MICROSCOPES from £11 lis. to £200. 



The £11 llg. Instrument consists of 1-inch and |-iiich Object-glasses, with Apertures 

 of 30 and 95 deg. respectively, coarse and fine Adjustment, Glass Sta.i?e and Bull's-eye 

 Condenser, fitted in mahogany case, and is most suitable for Students, Brewers, &c. 

 WATER AND OIL IMMERSION LENSES. 



Manufactory : 170, EUSTON ROAD, LONDON, N.W. 



HISTOLOGICAL MICROSCOPE, 



With, l-inch. and |-incli Objectives of splendid Definition, 

 Eye-piece, and Case, £5 IDs. 



Full particulars free per post. 



Harley Binocular Microscopes, Dissecting Microscopes, Lamps, Objectives, Thin Glass 

 Slips, Mediums, and every requisite for the Study. 



THIRTY-SIX PAGE ILLUSTRATED CATALOGUE ON APPLICATION. 



CHARLES COLLINS, 



IST', Gr-eat Portland Stx-eet, London, TV. 



W. P. Collins' Science Book Depot, adjoining the above. Catalogue on application. 



