583 NEW JEKSEY AGKlCrLTUKAL COLLEGE 



Tlio Si'liociniKiker I'oinbinntion mav Ih^ excluded from \\\e eoin- 

 })arison bcvaiisH^ it is not a straialir arsenate of lead, but when used 

 as an insectieiile it should have ar least tAviee the \veight ordinarilv 

 reoonnneudeil to obt^iin the desired effei^t. The water in this ma- 

 terial is less in quantity than in any other of those tested. 



Of the rest, the Target brand contains more Avater and les? 

 ai-senic than any other sample, Wsides being short \veight, hence* 

 gives less vahu^ for the price charged. The IHsparene, which is 

 most nearly com]iarable with it in cousistency and actual comjmsi- 

 tion, is full wiMght and has less water with more arsenic than any 

 except the Vreehuul sam]ile. The Eagle brand, tlumgh ap- 

 jnu'cntly drier, really contains a large }xnventage of water, but no- 

 glucose or similar material, and an arsenic content not much below 

 the I)is]iareue. It is by all odds the cheapest of the brands regu- 

 larly on the nutrket. so far as they have come under my notice. 



The Coo]>er ]u-oduct was a -special order, ajid ranks above the 

 Targx?t brand, but below all others, in arsenic. I underst^md that 

 the price was about thirteen cents jxn* potuul. making it somewhat 

 more expensive than the Eagle brand, than which it contains less 

 water. 



The Vretdand sample has a very high percentage of ai-senic. and 

 is said to be a new process material. It has never been tested, and 

 is not yet regularly on the market, Init if it can be produced at a 

 satisfactory price it will deserve the fullest tesf?^.* 



The point to be noted is that, excluding this Vreeland sample, it 

 re0juii*ed over three pounds of the Pisparene and over four p^^unds 

 of the Targvt brand to do the work of one pound of a fair quality 

 of Paris green, and that it will require nearly four pounds of 

 Target brand to do the work of three }>ounds of Dispaivne. 



For the convenience of piiivhasers every manufacturer should 

 print on the labels a statement of the minimum qmmtity of arsenic 

 contained in his product as a giiide to the strength at which it 

 should be used. 



ISTo test for Avater solnble arsenic was made with any sample, but 

 of the three kinds used by me, none caused any iniury to foliage. 



It was not intended to test or analyze all the brands of ai'senate 



* The material m.iy now be obtained from the National Svnoe Company. 123 

 Maiden Lane. New York, at a price of lO^-jO. per pound, in l(^K>-pound ■steet 

 buckets; cans of one pound. 15c. These prices will probably stand reductioni 

 later. 



