SCIENCE— ADVERTISEMENTS 



Coors U. S. A. 



Chemical Porcelain 



— characterized hy 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 Glassw^are 



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

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

 efHc ent. Let us meet your requirements. 



Order Pyrex in Case Lots 

 lO per cent Discount 



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

 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. 



I^m €i«^imrtf 011 



Laboratory Apparatus — Chemicals — Glassware 

 ROCHESTER, N. Y. 



