A WEEKLY ILLUSTRATED JOURXAL OF SCIENCE. 



" To the solid ground 

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



.1519! 

 fa. 



VOL. 102] THURSDAY, DECEMBER 5, 1918 



[Price Ninepeni e. 



Hrcisitrt-d as n Newspaper u the General Post Office] 



[All Rights Reserved. 



OPTICAL PROJECTION APPARATUS 



of 



EVERY DESCRIPTION. 



LOW POWER PROJECTION MICROSCOPE 



for attachin; al Lantern. 



NETrVTON & CO. 



[late of 3 / 



72 WIGMORE STREET, LONDON, W.I. 



DUROGLASS L™ 



14 CROSS STREET, HATTON GARDEN, E.C. 



Manufacturers of 



Borosilicate Resistance Glassware. 

 Beakers. Flasks, Etc. 



Soft Soda Tubing for Lamp Work. 

 Genera! Chemical and 

 Scientific Glassware. 



Special Glass apparatus Made to Order. 



DUROCLASS WORKS, WALTHAMSTOW. 



AGENTS: 



BAIRD & TATLOCK (LONDON) LTD. 

 14 CROSS ST., HATTON GARDEN, E.C. I. 



VITREOSIL 



{Pure Fused Silica.) 



LABORATORY WARE 



Finely Glazed Crucibles, Basins, 



Capsules Beakers, 



Tubes for Carbon Estimation, 



and Heat Treatment of Metals. 



Superior to any Porcelain made. 



THE THERMAL SYNDICATE, Ltd., 



WALLSEND-ON-TYNE. 

 28 VICTORIA STREET, S.W. i. 



ACCURATE 



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Send a note of your requirements 



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NEOREXTI &. ZAMBRA, 

 38 MOLBORN VIADUCT, E.C. J 



5 LEADEN.HALL ST. LONDON. '" RE £f? T ST ' 



E*- Our City Branch is at 5 LcaJtnhall Street. EC. 3 



