A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



MINIATURE ARC LAMP. 





Will work from any ordinary house lighting circuit. 

 Complete with resistance and ^O O ft 



mechanical tray *'«' " •* 



(For alternating current 10/6 extra.) 



Il'nie for Special Leaflet. 



I^^E'yy'rON' &, CO. (late of 3 Fleet street), 



Optician!, hy Royal Warrant to H.M. the King. 

 72 'WXCIMORE: STStSllE'r, -w. 



NEW 'LONDON' 

 MICROSCOPE. 



THE HANDLE MODEL WITH 

 LARGE BASE. 



FINISHED IN BLACK ENAMEL, 

 model of the London Student's 



Micro>cope has an extra large and heavy 



base, giving it great stability. 



It is on the Handle 

 Model and the illus- 

 tration shows its con- 

 venient pattern. 



£ s. d. 



No. 1326 Stand ...3 13 



„ 364A Eyepiece 5 

 „ 802 'i" Object 



Glass 12 



,, 804 S" Object 



Glass 1 10 

 ,, 3Q2A Double 



Nosepiece 9 



6 90 



No. 132S Stand with 

 fucu.Mni.- ^uh»l:.ge,£4.7.6 



R,&J.BEck,Ltd. 



63 CORNHILL, LONDON. E.G. 



^— I Negretti 8- Zambra's j 

 " Horticultural 

 Hygrometer " 

 gives warning of 

 the probability of 



FROST 

 during the night. 



Price 21/- 

 Wrile for descriptive 

 pamphlet — sent free. 



NEGRETTI & ZAABRA, 



Scientific Instrument Makers. 



Holborn Viaduct, London, E.G. 



Branches ;— 

 45 Cornhill, JU^-W2-tlcteU^St., W. 



=^r#»= 



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FEB 24 1918 



