A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

 Oj Vd the mind which builds for aye." — Wordsworth. 



OPTICAL PROJECTION APPARATUS 



of 



EVERY DESCRIPTION. 



LOW POWER PROJECTION MICROSCOPE 



ffjr attaching 10 any Optical Lantern. 



NElflTTON & CO. 



[late of 3 Fleet Street), 

 11 WIGMORE STREET, LONDON, W.I. 



DUROGLASS L™ 



14 CROSS STREET, HATTON CARDEN, E.G. 



Manufacturers of 



Borosilicate Resistance Glassware. 

 Beakers. Flasks, Etc. 



Soft Soda Tubing for Lamp Work. 

 General Chemical and 

 Scientific Glassware. 



Special Glass jjpparatus Made to Order. 



DUROGLASS WORKS, WALTHAMSTOW. 



AGENTS : 



BAIRD & TATLOCK (LONDON) LTD. 



14 CROSS ST., HATTON GARDEN, E.C. 1. 



^>X BASINS, BEAKERS, BOATS, 

 T^V CAPSULES, CONDENSERS, 

 j5^\ CRUCIBLES, FLASKS, 

 ^\ RETORTS, 

 \^J*\ TRIANGLES, 

 ^V TEST-TUBES, 



^ V0\ TUB1NG » 

 \^>\ ETC - 



List free on application to \^^ \ 



THE SILICA SYNDICATE, Ltd., N. ^ 



28 VICTORIA STREET, \S^i 

 WESTMINSTER, S.W.I \5, |§> 



We 



specialise 

 in the raanu 

 facture of 

 apparatus to cus 

 toraers' own designs 



ACCURATE 



AND 



RELIABLE 

 THERMOMETERS. 



Send a note of your requirements 



to any of our addresses, and we 



will offer you the best types we 



have in stock. 



NEGRETTI &, ZAMBRA, 

 38 HOLBORN VIADUCT, E.C. 1 



LONDON. ■" KE £ E ? T ST - 



3*" Our City Branch h at 5 Leadenholl Street. EC. 3 



S LEADENHALL ST 

 E.C. 3 



