SCIENCE— ADVERTISEMENTS 



Coors U. S. A. 



Chemical Porcelain 



— characterized by its uniformity of shapes and its general excellence. 

 It has established its quality in a series of comparative tests, proving it to 

 be of very high standard in its resistance to alkali, thermal resistance, and 

 the high temperature which its glaze will withstand without softening. 



For that reason we carry a full stock of current sizes, ready for 

 immediate shipment. We are equally prepared to serve you in 



Pyrex 



Chemical Glass>vare 



which has demonstrated, in exacting usage, its high grade in composition, 

 stability, resistance to sudden cooling, hardness and its low expansion co- 

 efHcient. Let us meet your requirements. 



Order Pyrex in Case Lots 

 lO per cent Discount 



These are two of the lines fully represented in our tin- 

 usually complete Laboratory Glassware Catalog. 

 Write for a copy today, if you have not already done 

 so, and let us know of any of your laboratory needs. 



Laboratory Apparatus — Chemicals — Glassware 

 ROCHESTER, N. Y. 



