PETRI DISHES 



The Petri Dishes now in our stock are of a 

 quality and finish superior to any dishes we have 

 had to offer since 1914. 



The 100 X 10 mm is the standard size for bacterio- 

 logical use throughout the U. S., but as there is an 

 increasing demand for a deeper dish, we also supply 

 100 X 15 mm dishes. 



The bottoms are exactly 95 mm outside diameter 

 and can be used with Clay Covers 97 mm inside diam- 

 eter, and the tops can be used with Clay Covers 103 

 mm inside diameter. The tops and bottoms are also 

 sold separately. 



Prices subject to change without notice 



ARTHUR H. THOMAS COMPANY 



WHOLESALE, RETAIL AND EXPORT MERCHANTS 



LABORATORY APPARATUS AND REAGENTS 



WEST WASHINGTON SQUARE PHILADELPHIA, U. S. A. 



