A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

 Of Nature trusts the mind which builds for aye." — Wordsworth. 



No. 1866, Vol. 72] 



THURSDAY, AUGUST 3, 1905, 



[Price Sixpence 



Registered as a Newspaper at the General Post Offic 



NEWTON & CO.'S 



^^^ LONG-RANGE 

 ELECTRIC 

 LANTERN. 



Single Long-range Lantern, bras^lrL.nl «uh 4' ■■ 

 extra large front lenses 3 in. in diameter. Coiiifkic 

 Universal" Hand-feed Arc Lainp in case, £22. 



This Lantern is as efficient as any we can make for showing slides in large 

 halls where electric current is available. 



3 FLEET STREET, LONDON. 



THE 



ASHEFINLAYSON 

 COMPARASCOPE. 



For viewing two specimens side by side in 



the field of view of one microscope for 



comparison purposes. 



P(trticiil<ifs o)i (ipjt/ictifion. 



R. & J. BECK, LIB. 



68 CORNHILL, LONDON, E.C. 



[All Rights are Reserved. 



THE "IDEAL" LABORATORY 



CLAMP. 



Special 

 Vamphlet 



MSI, O. I>YE & CO., 



SCIENTIFIC INSTRUMENT MAKERS, 



GRANTA WORKS, CAMBRIDGE. 



NEGRETTI & ZAMBRA'S 

 LONG RANGE 



BAROMETERS. 



THE GLYCERINE BAROMETER. 



Further Particulars and Prices of this and other 



long range "Barometers sent on application 



to the Manufacturers— 



NEGRETTI & ZAMBRA, 



38 HOLBORN VIADUCT, E.C. 



t, Branches: 45 CORNHILL, and 122 REGENT 

 STREET, LONDON. 



