SCIENCE 



New Series. 

 Vol. IX. No. 234. 



FrTDAV TtTiSTF 9^ 1SQQ single copies, 15 cts. 



XKiUAY, OUSSih /,0, lOyy. annual Subsckiption 



Annual Subsckiption, 85.00 



/MANUFACTORY OF THt\ 

 pAUSCHSiLOMB OPTICAL CO 

 ~- ROCHESTER 



Our Policy 



DURING the half century in which our business has been developing we have directed our 

 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 invite comparison of our products with any others and solicit lists of apparatus for 

 estimates. 



BAUSCH & LOMB OPTICAL CO. 



Manufacturers of Microscopes, Microtomes, Photomicrographic 

 Apparatus and Laboratory Supplies 



NEW YORK CITY 



ROCHESTER, N. Y. 



CHICAGO 



