EXPERIMENT STATION EEPORT. 581 



leading brands side bj side I ordered some sixty pounds from 

 the Adler Color and Chemical Company, of New York (Eagle 

 3)rand) ; fifty poimds from the American Horticultural Distrib- 

 uting Company, of West Virginia (Target brand), and fifty 

 pounds from the Bowker Insecticide Company, of Boston, Mass. 

 (Disparene). I paid for the Eagle brand twelve cents per pound 

 (in one-pound cans), for the Target brand twenty cents per pound 

 (in two-pound cans), and for the Disparene twenty- four cents per 

 pound (in two-pound cans). The Eagle brand cans were uni- 

 :formly overvveight, the Disparene was almost exactly correct 

 ^nd the Target brand was uniformly underweight. The Eagle 

 brand was a dry paste, while the other two were sloppy in con- 

 sistency. This does not, however, mean more water, but the addi- 

 tion of glucose or some other product to increase adhesive quali- 

 ties. All of these materials, be it said here, gave equally satis- 

 :factory results when sprayed at the strength of approximately five 

 pounds to one hundred gallons of water. 



During the summer Mr. Carl Bannwart, secretary of the NTew- 

 •ark Shade Tree Commission, and in charge of the spraying work, 

 had some difficulty with the material used by him, and sent in two 

 •samples for analysis, stating that he had no sort of guide as tO' the 

 ■amount of arsenic actually present in the material, and could not, 

 therefore, use it intelligently. One of these was supposed to be a 

 •straight arsenate o^lead (Cooper sample); the other was a com- 

 bination supposed to contain copper and to be a combined insecti- 

 cide and fungicide. 



I handed samjdes of all of tliese materials to the chemical de- 

 partment, including also a new product just sent in for trial, and 

 received the following report from Mr. J. P. Street, Chemist to the 

 Station : 



Analysis of Arsenate of Lead. 



ilanufactun r. Water. Arsenic Oxid. 



Adler '. . . . .51.59 14.74 



Cooper 41.65 1.3.10 



Schoonmakei- (with Bordeaux) 23.97 5.58 



Bowker 41..50 15.34 



Target Brand 57.62 12.14 



Vreeland 44.67 20.12 



No attempt was made to do more than determine, first, the actual 

 amount of water in the sample, and second, the actual amount of 

 .-arsenic oxid (Aso O5). 



