^s^Wi 



pS^t^S^^Bk 



Demonstration Osmoscope 



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

 as to exhibit osmotic absorption in visible progress before the 

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

 its rapidity of operation, convenience of manipulation and con- 

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

 size of the original. Complete, $4.25. 



One of the new pieces of apparatus described in our new 

 Ganong Apparatus Catalog which will be sent free on request 



gausch y Ipmb Optical (5. 



NEW YOIiK WASHINGTON CHICAGO SAN FRANCISCO 



LONDON liOCHESTEn.N.Y. ^^^^^^otit 



