New York Agricultural Experiment Station. 335 



while paris green settled to the bottom of the vessel in about five 

 minutes, the green arsenite remained in suspension over two hours. 

 It is used in the same proportions as paris green, one pound to from 

 150 to 200 gallons of water, using lime to prevent injury to foliage, 

 or it may be added to bordeaux mixture in the same proportions. 



Green arsenite is a name given to a commercial substitute for 

 Scheele's green. It is variable in composition and hence less reliable 

 than that poison. 



PARIS GREEN. 



Paris green may be applied either in the dry form or as a spray. 

 When the spray is used the paris green may be combined with 

 bordeaux mixture, or it may be applied mixed with water. In either 

 case the same amount of poison is used. For pomaceous fruits, 

 such as apples and pears, one to two pounds of paris green to one 

 hundred and fifty gallons of water is recommended. Many are using 

 much more than this amount but the more the strength is increased 

 the greater the danger of injuring the foliage. For stone fruits the 

 mixture should be weaker, using one pound of paris green to two 

 hundred and fifty or three hundred gallons of water. When used 

 with water, two pounds of freshly slaked lime must be added for 

 each pound of paris green, to prevent injury to the foliage. 



Where adulteration is suspected, if some of the poison is crushed 

 between two pieces of window glass or between the thumb and finger, 

 oftentimes some small lumps will be found white inside, showing 

 that some adulterant has been used. The ammonia test, which is 

 very simple though not infallible, may also be used. Pure paris 

 green will readily dissolve in ammonia and the solution will be of a 

 deep blue color. If there is any residue left, or if the solution does 

 not become blue at once, adulteration may be suspected. 



The law in this State fixing the standard of paris green has largely 

 stopped the practice of adulteration, and this poison as sold here 

 may be regarded as reliable. For information regarding the purity 



