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. 
BINDER & SELL., 
P. O. BOX 712. 
518-520 MINOR ST., PHILADELPHIA. 
