CIENCE 
NEw SEEIEs 0 SINGLE COPIES, 15 Crs. 
Vou. XXXY. No. 899 Fripay, Marcu 22, 191 2 ANNUAL SUBSCRIPTION, $5.00 
Leads Schools and Colleges all over 
the Country use 
Bausch fomb 
Microscopes 
They combine greatest optical effi- 
ciency with greatest convenience and 
durability. 
Microscope BH is generally the 
choice of schools. It is supplied 
complete with 7.5x (1 1-3 inch) 
eyepiece, 16 mm. (2-3 inch) and 4 
mm.(1-6 inch) objectives, and double 
circular dustproof nosepiece, in carry- 
ing case, price $31.50. Magnifica- 
tionsare 75 and320 diameters—but— 
other eyepieces can be providéd-to 
supply different magnifications at the 
same price. 
Special prices to schools. 
Our new catalog 15A, entitled “School Equipment,” is 
Our name, backed now ready for distribution. A copy will be mailed free 
by over half a century 
aN on request. 
of experience, is on all 
our products — lenses, 
fina, caine RAUSCH €¥ Lomb Optical CG. 
aratus, engineering Sie PSNI Vie» ELIA EIB, E eye 
oi other scientific NEW YORK [WASHINGTON __|CHICAG © _SANTFRANCISCO 
instruments. LONDON ROCHESTER.N NY, FRANKFORT 
