INJURIOUS INSECTS OF 1903. 103 



When completely air-slacked, this should then be sifted 

 through a fine sieve ; a lOO-mesh sieve is the proper one t6 

 use. One can break up the lumps in this sieve so as to util- 

 ize the bulk of the air-slacked lime by rubbing it through 

 the sieve by means of a block of wood. As this is a stock 

 dust, to be used as a carrier in the place of water, it would 

 be just as well to make up a much larger quantity, so as to 

 have it on hand at a minute's notice. After it is thor- 

 oughly air-slacked and sifted, the powder should be kept 

 in a dry place, such as the hay loft or the garret of the 

 house. 



"Dissolve 4 pounds of copper sulphate in 2^ gallons 

 of water by placing the copper sulphate in a coarse bag 

 and suspending it just below the surface of the water until 

 dissolved. This is to be kept in a vessel by itself. 



"Slack 4 pounds of good quicklime by sprinkling over 

 it slowly 254 gallons of water in such a manner as to slack 

 the lime to a fine powder and give as a result a milk of lime 

 solution. This must now stand until cooled before using 

 it. 



"In a large shallow box one should then place 60 

 pounds of the sifted air-slacked lime which has already 

 been made as a stock carrier. In another vessel pour the 

 milk of lime and the copper sulphate solution, both at the 

 same time, and stir thoroughly until the whole is well 

 mixed. Then turn this into a double flour sack and 

 squeeze out most of the water. 



"Empty this blue material just made into the 60- 

 pounds of air-slacked lime, and at once work it up thor- 

 oughly with a hoe. If after this has been thoroughly 

 mixed the material is too wet, more of the lime dust should 

 be added. This material must then immediately be rubbed 

 through a comparatively coarse sieve, while it is still 

 somewhat damp. It should then be thoroughly mixed 

 again by means of a stick and spread out in a dry place 

 and allowed to dry. When this is perfectly dry it must 

 then be sifted through a fine sieve of 100 meshes, in which 

 case all lumps can be ground by means of a stick rubbed 

 over the sieve. The resultant powder should have a uni- 



