INVESTIGATION OF AMERICAN STAINS 129 



manufacturers, as the production of biological stains is a very 

 small part of their business and the results of this work mean 

 Uttle to them. In general, hearty cooperation has been secured. 

 All but two of the dealers have told us to feel perfectly free to 

 publish the results. As these two are merely distributors of 

 scientific supplies, and as it is diflicult to tell the original source 

 of the samples obtained from them or to leam whether their 

 present suj^ply is still the same, their names are suppressed here, 

 using instead the designations A and B. P"'or similar reasons the 

 name of a third house of like character is suppressed, although 

 in this case the committee was not asked to do so. 



The list of dealers (other than these three) whose products 

 have been examined is as follows. In this list the addresses are 

 given for those firms who deal specially in biological stains. 



Calco Chemical Company, 136 Liberty Street, New 

 York City 



Coleman and Bell Company, Norwood, Ohio 



Dicks, David and Company 



E. I. duPont de Nemours Company 



Geigj' Chemical Company 



Goldin Biological Laboratories, Providence, R. I. 



Harmer Laboratories Company, Lansdowne, Pa. 



Heyl Laboratories, 437 Baretto Street, New York City 



Holland .\nilin Company 



H. S. Laboratories, 6005 Girard Avenue, Philadelphia 



H. Kohnstam and Company 



Mallinckrodt Chemical Company 



Merck and Company 



National Anilin Company 



Newport Chemical Works 



Providence Chemical Laboratories, 51 Empire Street, 

 Providence, R. I. 



Williamsburg Chemical Company 



Very few tests were made with the products of the Heyl 



Laboratories. This was merely because the Heyl products are 



sold under certain restrictions that make it difficult for jobbers 



to buy them. We could have obtained all the Heyl stains we 



JOUBNAL or BACrSRIOLOOT, VOL. VII. NO. 1 



