ADVERTISEMENTS, vii 
CARDS FOR MOUNTING SPECIMENS. 
We make a specialty 
of these cards, and it 
will be to YOUR ADVAN- 
TAGE tO get Our PRICES 
when in need of them. 
We can supply them 
in any size in BLACK Or 
WHITE centers. 
BLN DER 06 ENGL. 
e O. BOX 712. 
518-520 MINOR ST., PHILADELPHIA. 
