SCIENCE-ADVERTISEMENTS 



Wehrsen Heavy Current Influence Machine 



Machine with two 50 cm. revolving dislcs delivers 600 micro-amperes, with 

 sparl< 30 cm. long. 



For further details 

 write to 



James G. Biddle 



Special Agent 



1211-13 Arch Street, 

 PHILADELPHIA 



THE M8CR0T0ME OF THE FUTURE 



LEITZ BASE SLEDQE MICROTOME 1914 



^^ The Principle is different — It has 



to be — in order to remedy the short- 

 comings of the Microtome to date. 



Extreme Simplicity 

 Incomparable Rigidity 



*" 3 Perfect Microtomes 



in one 



BASE SLEDGE MICROTOME for parafKne and celloidin cutting, complete 



Any good Microtome Knife may be used. 

 Leitz SPECIAL BASE SLEDGE MICROTOME KNIFE 

 Large'COz Freezing Chamber (3 in. diam.) optional 



Write for special circular 



Duty Free S62.50 



6.50 

 " 10.40 



BRAINOH 



INEW VORK 

 30 East 18th Street 



