fduTon'ff "o^r^ CATALOGUE 



is now ready for distribution 



In this edition there are listed 9,316 apparatus items illustrated by 

 original wood cuts, and 5,549 reagentlitems. A telegraphic code word is 

 given for each size of every apparatus item and for each stock package of 

 every reagent. The prices printed are net, with quantities contained in. 

 and discounts allowed forjoriginal packages. 



The selection of merchandise listed is based upon thirty years of ex- 

 perience in the supply of apparatus and reagents to chemical, metallur- 

 gical and biological laboratoriesjand has been made with painstaking 

 care. The various items are described and illustrated without exaggera- 

 tion and with as much dicussionfand illustration of underlying principles 

 and details of construction as is necessary for wise selection. The name 

 of the author, with full reference to his publications bearing on the item 

 in question, is given where such data is likely to be of value. 



We suggest that scientists in requesting copies of tliis catalogue 

 state the capacity in which 'they are connected with organized 

 laboratory work, and mention this journal in writing. In large 

 laboratories and departments where many workers are engaged, we 

 prefer that the request for catalogues come from the professor in 

 charge of the department, laboratory director, chief of bureau, 

 chief chemist, pathologist, bacteriologist or other scientist in 

 charge of laboratory work, with the names of colleagues, asso- 

 ciates or assistants to whom, in his judgment, additional cata- 

 logues should be sent. Requests from firms or institutions should 

 state the name of the scientist or officer for whom the catalogue is 

 desired so that we may check against subsequent requests from 

 individuals. Such cooperation assures adequate distribution and 

 at the same time [reduces unnecessary duplication in the same 

 laboratory. 



While the sending of this catalogue involves no obligation to purchase of 

 us, the expense of prepara(ion]and publication necessitates a reasonable 

 control of the distribution. 



Separate pages have been prepared for sending in a loose-leaf binder 

 to those whose interest is temporary or restricted to a given subject or 

 "^ item rather than in the regular use of the complete catalogue. 



ARTHUR H. THOMAS COMPANY 



WHOLESALE, RETAIL AND EXPORT MERCHANTS 



LABORATORY APPARATUS AND REAGENTS 



WEST WASHINGTON SQUARE PHILADELPHIA. U. S. A. 



Cable address. "Balance." Philadelphia 



