SPRAYING 207 



bottom of this mixture, and to avoid this 

 it must be constantly stirred while being 

 applied. This chemical is often adulter- 

 ated with white arsenic, causing it to badly 

 scorch the treated plants. 



For sweet peas, the use of arsenate of 

 lead is to be preferred to Paris green, since 

 it is less liable to scorch the foliage, and 

 adheres better. Its chemical composition 

 consists of acetate of lead and arsenate of 

 soda. It is applied to the best advantage 

 as a liquid, using about three pounds to 

 100 gallons of water. 



Arsenite of zinc may also be used. It is 

 a very finely divided fluffy white powder 

 which distributes and adheres well to the 

 foliage. It is intermediate between Paris 

 green and lead arsenate in strength, and 

 costs less than either. 



It is essential when arsenicals are used 

 to see that they are correctly labeled, and 



