Those wishing good herbarium specimens will find it most 
convenient to send their lists of desiderata to 
SANDBERG’S BOTANICAL EXCHANGE BUREAU. 
$7.00 per hundred. Satisfaction guaranteed. 
Address J. H. Sandberg, reer Minn. 
501 CENTRAL AME. ,. 2 
Henry Heil Chemical Co, 
ot. LOuUrTS; BN? 
Chemicals and Apparatus 
LABORATORY 
SUPPLIES 
GIVE US A TRIAL. YOU WILL FIND US PROMPT AND CHES? 
Before Ordering Elsewhere, Get Our Quotations. 
Large lilustraied Catalogue on Application. 
Dissecting Microscopes, 
IN EVERY VARIETY: 
_BAUSCH & OMB “OPT, £0. 
Rochester, N. Y. 
