A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



* ' To the solid ground 

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



New Optical Lantern Attachment 



PROJECTION POLARISCOPE 

 MICROSCOPE & SPECTROSCOPE. 



Write for Catalogue, Section " G. '* 



NEWTON 81 CO., 



Specialists in Optical Projection Apparatus. 



72 Wigmore Street, 



LONDON, W.l. 



BA1RD &. TATLOCK( LONDON'LTD R m 



SCIENTIFIC INSTRUMENT MANUFACTURERS 

 and LABORATORY FURNISHERS. 



Physical 



Apparatus 



for 



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and 

 Colleges. 



RESISTANCE BOX 



tt-15 CROSS STREET HATTON GARDEMOJIDONEO 



REYNOLDS & BRANSON, Ltd. 



LABORATORY FURNISHERS AND MANUFACTURING CHEMISTS. 



•enovatk d and repaired in our own Workshops. 



nd other Balances and Weights, see special Cataloj 

 Post Free on request. 



14 Commercial Street, Leeds. 



HOLIDAY 

 BINOCULARS 



We have over 40 different Prism ' 

 models, and many second-hand pat- 

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 "B.N.," or for a selection on approval. 



^EGRETTI © ZAMBRA 



38.HOLBORN VIADUCT. E .C 1 . 

 LONDON. 



