SCIENCE 



v^ ^^?^v.T K. o.« Friday, February 28, 1913 f °^= ^opikb, 15 cts. 



Vol. XXXVII. No. 948 ' ' Annual Sdbsoeiption, $5.00 



The intimate alliance between the 



CARL ZEISS OPTICAL WORKS 



and the 



BAUSCH & LOME OPTICAL CO. 



is a distinct boon to the American user of 

 optical instruments. Not only does it 

 mean an interchange in ideas— the union 

 of scientific and productive effort — but it 

 now affords a ready source of supply in 

 America of the different Zeiss lines in 

 most general demand. 



To effect this we have imported a stock of Zeiss Pro- 

 ducts, not only for our home office but for each of our 

 branches, to which we invite the personal inspection of all 

 interested. From this stock we are prepared to make 

 prompt shipments at duty paid prices. 



We are also glad to serve customers at any time in import- 

 ing Zeiss products as promptly as possible at duty free 

 prices. Zeiss literature on any of the lines will be sent 

 free upon request. 



Bausch ^ Ipmb Optical Q. 



NEW YOnK WASHINGTON CHICAGO SAN FRANCISCOi 



LONDON liOCH ESTER, N.Y. n*ANKroRT 



