NEW CATALOG "'MICROTOMES 



Containing full descriptions 

 and Photographic Illustrations 

 of our entire line of remodeled 

 microtomes and accessories, 

 including several 



NEW MICROTOMES 



This new series is the most 

 complete and practical ever 

 listed, and every user of a 

 Microtome should have a 

 copy of the book for refer- 

 ence purposes, if for no 

 other reason. Mailed free. 



Bausch & Lomb Optical Co. 



ROCHESTER, N. Y. Chicago 



PHYSICAL REVIEW 



American Physical Society 



Eighteenth Volume Begins JANUARY 1904 



ELISHED MONTHLY ANNUAL SUBSCRIPTION $5. 



SAMPLE COPY UPON REQUEST 



THE MacMILLAN COMPANY, 



