388 R.EroKT of the Entomologists. 



cal Works, New York city. In addition to its cheaper price, it 

 has the advantage of being much more finely divided than Paris 

 green, and hence stays suspended in water for a considerably 

 longer time. It is, therefore, less difficult to keep well distributed 

 in the tank, thereby ensuring a more even application to the 

 foliage. 



Arsenite of lime. 19 — This arsenical will remain suspended in 

 the tank as long as green arsenite, and has the additional advantage 

 of being still cheaper and also of being conveniently made at home, 

 thus ensuring freedom from adulteration. 



According to estimates by Dr. Kedzie it costs but 70 cents per 

 -800 gallons when ready to use or but 3-4 of a cent per barrel, while 

 Paris green costs, when used at the rate of 1 pound to 150 gallons 

 of water, about 10 cents per barrel (retail price) and green arsenite 

 5 cents per barrel. 



19 Directions for making and handling. arsenite of lime are given in the 

 M. A. G. Record, March 9, 1897, as follows: "Dissolve the arsenic by boiling 

 with carbonate of soda, and thus insure complete solution; which solution 

 can be kept ready to make a spraying solution when wanted. To make 

 material for 800 gallons of spraying mixture boil 2 pounds of white arsenic 

 with 8 pounds of sal soda (crystals of carbonate of soda, ' washing soda,' 

 found in every grocery and drug shop) in 2 gallons of water. Boil these 

 materials in any iron pot not used for other purposes. Boil for 15 min- 

 utes or till the arsenic dissolves, leaving only a small muddy sediment. Put 

 this solution into a two-gallon jug and label ' Poison, stock material for 

 spraying mixture.' 



" The spraying mixture can be prepared whenever required, and in the 

 quantity needed at the time, by slaking 2 pounds of lime, adding this to 40 

 gallons of water, and pouring into this a pint of the stock arsenic solution. 

 Mix by stirring thoroughly, and the spraying mixture is ready for use. The 

 arsenic in this mixture is equivalent to 4 ounces of Paris green." 



Another method of preparing a white arsenic and lime mixture is given 

 by L. R. Taft in Mich. State Agr. Coll. Expt. Stat. Bui., 155, p. 294, as follows: 



White arsenic 1 pound. 



Lime 10 pounds. 



Water 400 gallons. 



v 



In preparing the lime and arsenic mixture, add 2 pounds of lime and 1 

 pound of white arsenic, to 2 gallons of hot water, and boil for at least 30 

 minutes. This should be added to 400 gallons of water, and 8 pounds of lime 

 additional used. Care should be taken to have the lime freshly slaked. 



