SCIENCE— ADVERTISEMENTS 



Laboratory problems require instruments of precision and the 

 greater their capacity for accuracy, the more dependable the results 

 of an investigation. 



iE:.. 



No. 905 



A Good Catalog 



ng easy 



The second half of the school year is upon us. If there is new 

 equipment needed for new classes or new courses, get the catalog 

 you need: — 



A — Agriculture Apparatus and Supplies. 



B — Biology Apparatus and Supplies. 



G — Physics and Chemistry Apparatus and 

 Supplies. 



Asl^ for copy, giving your Official Position 



A SIGN OF QUALITY 



A MARK OF SERVICE 



W. M. WELCH SCIENTIFIC COMPANY 



Manufacturers, Importers and Elxporters of 

 Scientific Apparatus and School Supplies 



1516 Orleans Street CHICAGO, ILL., U, S. A. 



