A WEEISGEY “Tee USDRATE DE JOURNAL OF SCIENCE 
** To the solid grouna 
Of Nature trusts the mind which 
builds for aye.”’—WoRDSWORTH 
No. 821, VOL. 32] 
THURSDAY, JULY 
23, 1885 [PRICE SIXPENCE 
Registered as a Newspaper at the General Post Office] 
[All Rights are Reserved 
AMATEUR 
PHOTOGRAPHERS 
SHOULD ALWAYS USE 
moe MAWSON PLATE. 
The BEST and CHEAPEST in the Market. 
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MAWSON & SWAN, 
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‘and 31, FARRINGDON STREET, LONDON. 
R. & J. BECK’S 
NeW MICROSCOPE, 
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Stand, with 1I-in. 
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[504 
Object- 
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Object-glasses ... 
Stand, with Rack and Pinion, 
coarse adjustment, 2 Eye- 
pieces, and I-in. Object- 
glass ... Scie tere 10-3 
Stand, with Rack and Pinion, 
coarse adjustment, 2 Eye- 
pieces, and r-in. and 4-in. 
Object-glasses ... 
440 
Full Descriptive Pamphlet sent on 
Application to 
R.&J. BECK, 68, Cornhill, London, E.C. 
THE NEW POCKET METALLIC THERMOMETER 
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Is as accurate as a Mercurial Thermometer and far more sensitive, 
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JOHN BROW NING, 
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NEGRETTI AND ZAMBRA, 
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NEGRETT! 
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Lllustrated Description Post Free. 
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1200 Engravings. 
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