lEN 



New Series 

 Vol. XXXVI. 



Friday, December 27, 1912 



Single Copies, 15 Cts. 

 Annual Scbsckiption , $5.00 



The Superior Quallts 

 ofBausch SLomb len- 

 ses, microscopes, field 

 glasses, pTojeclion ap- 

 paratus, engineering 

 and other scientific in- 

 struments is the product 

 of nearly Sixty Years ' 

 Experience. 



Leading Science 

 Teachers 



endorse the high optical effi- 

 ciency, standard construction 

 and simple, easy operation of 



^auscli^lomb 



Microscopes 



Their manifold advantages make them 

 the popular choice for laboratory work in 

 leading colleges and schools. 

 Our new Model F comprehends many desirable improve- 

 ments. Provides unusual space for object manipulation with 

 its long curved handle arm with large stage. Bearing and 

 line adjustment parts all are carefully protected and dust] 



Write today for our Circular 15 A. It contaiils DE 

 detaUed information and specification \ a 

 of Model F. ^ 



Bausch £f Ipmb Optical ©. 



NEW YORK WASHINGTON CHICAGO SAN FRANCISCO 



LONDON liOCHESTEa, N.Y. fRANKroar 



