A WEEKLY ILLUSTRATED ‘JOURNAL OF SCIENCE 
“To the solid grouna 
Of Nature trusts the mind which builds for aye.” —WoRDSWORTH 
No. 823, VOL. 32] 
THURSDAY, AUGUST 6, 1885 
[PRICE SIXPENCE 
Registered as a Newspaper at the General Post Office] 
[All Rights are Reserved 
AMATEUR. PHOTOGRAPHY. 
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MARION’S Practical Guide to Photography. Second Edi- 
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MARION’S Alpha Paper Prints by Gaslight in 
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