Ohe 
feiss Photomicrographic Outfit 
For Ultra-Violet Light 
is a new and powerful instrument of research. Not 
only does it present a resolving power nearly eighty 
per cent. greater than can be attained with white 
light, but it gives most remarkable results in the 
optical differentiation of unstained and living tissues. 
Full particulars and prices on request. 
THE SCIENTIFIC SHOP 
ALBERT B. PORTER 
Scientific Instruments 326 Dearborn St., CHICAGO 
| BOTANICAL APPARATUS 
M O R 
SPECIALTIES 
GLINOSTATS, POTOMETERS, 
| AUXONOMETERS, 
CLEMENTS’ PHOTOMETERS, 
| nal SUS PRATED CASAL ORR DESCRIB- 
BOVE PIECES AND OTHER 
na hei: APPARATUS. WILL BE SENT 
UPON APPLICATION ce 
Cc. H. STOELTING CO. 
wkN- OU PA CF UR BRS 
LABORATORY APPARATUS AND SUPPLIES 
37 WEST RANDOLPH STREET 
CHICAGO, ILLINOIS 
3276. Auxonometer. 
