SCIEN 
NEw SERIES. SINGLE CopPiEs, 15 CTs. 
VoL. X. No. 239. FRIDAY, JULY 28, 1899. ANNUAL SUBSCRIPTION, $5.00 
J MANUFACTORY OF THE” 
BAUSCH & LOMB OPTICAL CO. 
an ROCHESTER .N.Y. 
OuUR POLICY 
efforts continuously toward the equipment of our manufactory in such a manner that 
from the raw material to the finished article every part and process could be done by us 
in our own establishment. To this policy we attribute the growth of the demand for our prod- 
ucts. We have made it a rule to do everything in the best possible manner, to spare neither 
labor nor expense in order to attain the highest grade of excellence. This gives us confidence 
in our apparatus such that when we place it where the test will be most severe we know that 
the results will be satisfactory because we know ‘how,’ “‘why’’ and ‘‘ what’ about every 
detail. We inyite comparison of our products with any others and solicit lists of apparatus for 
BAUSCH & LOMB OPTICAL CO. 
Manufacturers of Microscopes, Microtomes, Photomicrographic 
Apparatus and Laboratory Supplies 
NEW YORK CITY ROCHESTER, N. Y. CHICAGO 
Dn: the half century in which our business has been developing we have directed our 
