;<lS*d 



^SUI 



Demonstration Osmoscope 



This instrument, designed by Piof. Ganong, is so constructed 

 as to exhibit csmctic absorption in visible progress befcre the 

 eyes of an on-looking class. It is particularly characterized b>- 

 its rapidity of operation, convenience of manipulation and con- 

 stant readiness for immediate use. The illustration is one-sixth 

 size of the original. Con:plete, $4.25. 



One of the new pieces of apparatus described in our new 

 Ganong Apparatus Catalog which will be sent free on request 



Bausch y Ipmb Optical (o. 



NEW YORK WASHINGTON CHICAGO SAN FRANCISCO 



LONDON I^OCHESTEH- N.Y. ^I^ANKTORT 



