SCIENCE 



New Sebies 



Vou XLVI. No. 1)82 



Friday, August 24, 1917 



SiNGLK Copies, 15 Cts. 

 Annual Subscription, ?5.00 



^auscli'lomk 



Microscopes 



BH 4 -$33.00 



Bauscb & Lomb Microscopes BH 4 and F4 are 

 among the leading laboratory models for school 

 use. The BH is the handle-arm type, the typical 

 American model which is so widely used because 

 of its sturdj' construction and ease of handling. 

 The F has the long curved arm which leaves the 

 stage entirely free for manipulation of the speci- 

 men. The rounded edges make for freedom 

 from dust. 

 Both of these instruments are constructed to 



F 4— $33.00 



withstand the rough usage of the laboratory. 

 The fine adjustment is of our lever type, which 

 is simple and durable. The fine adjustment 

 head is locked to prevent removal. The coarse 

 adjustment is provided with a stop to prevent 

 the pinion from over-riding the rack. 

 The "4" outfit includes 16 and 4 mm. objectives 

 on dust-proof, revolving nosepieoe and stage 

 iris diaphragm; 5x and lOx eyepieces, complete 

 in cabinet with lock and key. 



Write for Circular 3 



Bausch ^Ipmb Optical (p. 



552 ST. PAUL STREET ROCHESTER, N.M 



New York Washingrton Chicago San Francisco 



Leading American Makers of Photographic Lenses, Microscopes, Projection Lanterns 

 (Balopticons), Stereo-Prism Binoculars and other High-Grade Optical Products 



