28 
poisons, and probably less effectual in their death-dealing 
power. They have the advantage of being very cheap. 
Arsenate of lead is kept in suspension without difficulty and 
is remarkable for its adhesive quality and its entire harm¬ 
lessness to foliage unless used in great excess. It kills 
slowly and its value for the destruction of the codling moth 
has not been very definitely determined. 
PREPARATION OF THE POISONS. 
Paris green, Scheele s green and London purple may be 
used in the proportion of i pound to 160 gallons of water. 
It is best to mix the poison in a small amount of water first 
and then in the full amount for which it was prepared. For 
each pound of poison used, add to the water one or two 
pounds of freshly slaked lime. This will lessen the liability 
of the poison to burn foliage. 
Arsenate of lime, by the Kedzie formula is prepared as 
follows: “Boil two pounds of white arsenic and eight 
pounds of salsoda for fifteen minutes in two gallons of 
water. Put into a jug and label ‘p°i son * When ready to 
spray, slake two pounds of lime and stir into 40 gallons of 
water, adding a pint of mixture from the jug.” 
If this formula is followed, be sure to use a full measure 
of fresh lump lime, otherwise some of the arsenic will be 
left in solution in the water and will kill the foliage. 
A somewhat simpler method of preparing arsenate of 
lime is to boil together for three-quarters of an hour 1 
pound of white arsenic, 2 pounds fresh lime, 1 gallon water. 
Use one quart of this to an ordinary barrel of water (about 
40 gallons). 
If a stock solution of this poison is kept, be sure to label 
it plainly “poison,” and it would be well to put in some kind 
of coloring matter besides. 
If arsenate of lead is employed, use not less than one 
and one-half pounds to 50 gallons of water. Lime need not 
be added to this preparation. 
If more than two applications are made, do not use the 
poisons in more than two-thirds of the above strengths after 
the second treatment. 
OTHER REMEDIAL AND PREVENTIVE MEASURES. 
Bandages of burlap or other cheap fabric placed about 
the trunks of the trees from the middle of June till Septem¬ 
ber will collect large numbers of the larvae which gather be¬ 
neath them for the purpose of changing to the pupa and then 
