VI 



SCIENCE— ADVERTISEMENTS 



Strength — Stability — Efficiency — Economy 



Paraffin was placed in two beakers of different makes, and melted. When the liquid reached a tem- 

 perature of 200° C, the beakers were plunged into a bucket of ice water. 



One of them did the expected thing: — it broke. 



The other withstood the test without developing a flaw: — it was Pyrex Chemical Glassware. 



This is just another proof of the remarkable strength of Pyrex — the strength that will cut down break- 

 age and increase economy in your laboratory. 



That Pyrex Ware conforms to most exacting laboratory requirements, and is, furthermore, the most 

 economical and efficient chemical glass in the world, has been repeatedly shown by tests and by actual use 

 in laboratories throughout the country. 



Pyrex Glass does not begin to soften below approximately 750° C, and a s mm. Pyrex glass rod heated 

 in an electric furnace does not break when plunged at a temperature of 300° C. into cold water. 



Pyrex Glass withstands water, mineral acids, carbonated alkalies, caustic alkalies, ammonia and 

 ammonium salts to a remarkable degree. 



Pyrex is American made, and is a low expansion borosilicate glass of simple composition, containing 

 no metals of the magnesia-lime-zinc group, and no heavy metals. Due to its superior strength, it is 

 ideal for use in the laboratories of schools and colleges, where apparatus is frequently subjected to rough 

 usage, and where laboratory expenses must be kept low. 



Chemists everywhere are specifying Pyrex Chemical Glass, thus cutting down overhead and increasing 

 efficiency. 



The complete Pyrex line includes a variety of shapes and vessels to meet every laboratory require- 

 ment. Special apparatus will be made to order from sketch or blue print. 



Pyrex is carried in stock by all reliable dealers in laboratory apparatus throughout the United States. 

 Illustrated catalog showing the entire Pyrex Chemical Glassware line, mailed upon request. 



PAT. 



CORNING GLASS WORKS 

 Chemical Glassware Division, Coming, N. Y. 



World's Largest Makers of Technical Glassware 

 NEW YORK OFFICE, 501 Fifth Avenue. 



LABORATORY 



PAT. 





