388 Report 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.— 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. C. 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. Bul., 155, p. 294, as follows: 
Whitetaraenit 25. fo bc aes wela ole ale ak wafers age een 1 pound. 
Bibel to eee Any Pee eee eee Ie EP ees ne 10 pounds. 
Water tore bis oc oa een se ig jaa eigen oa leet ol ee 400 gallons. 
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. | 
