REMEDIAL MEASURES 95 



ounces of acetate of lead in 4 quarts of water, in a wooden (not 

 metal) pail, and 4 ounces of arsenate of soda (50 per cent.) in 

 2 quarts of water, in another wooden pail, and when entirely 

 dissolved mixing them in a hogshead containing 150 gallons of 

 water, when a chemical reaction will take place, forming arse- 

 nate of lead as a fine white powder in suspension in the water. 

 If cold water be used in the wooden pails, the solution of the 

 acetate of lead will require a little time ; but, however, if the 

 water be hot, it will dissolve very quickly. It is customary to 

 add from 2 to 4 quarts of glucose to the above amount of 

 water. If it is desired to use larger proportions of the arsenate 

 of lead, it is only necessary to use more acetate of lead and 

 arsenate of soda, but in the proportions given above." 



Another substance which has lately been put upon the 

 market as a substitute for Paris green, is called Green Arsen- 

 ite. It is a finer powder than Paris green and generally costs 

 at retail, 15 cents a pound. It can be purchased of dealers 

 generally, or direct of the manufacturers the Adler Color and 

 Chemical Company, New York. One great advantage it has 

 over Paris green, is that being a finer powder it remains in 

 suspension much longer. A little lime water should be added 

 to the mixture as in the case of Paris green. It is to be used 

 at the rate of four or five ounces to fifty gallons of water. 



Killing the Older Caterpillars. After the caterpillars are 

 half-grown they commonly come down to the lower branches 

 or the trunk to undergo the moulting process. To this end 

 they gather in great masses on the bark, where they may be 

 destroyed by means of a stiff broom more effective perhaps if 

 frequently dipped in kerosene, or by collecting the caterpillars 

 in pails containing a little kerosene and water. In the towns 

 and villages throughout the infested regions vast numbers of 

 the pests were destroyed in these ways, especially the latter, 

 in 1898. 



Banding. The fact that so large a proportion of the cater- 

 pillars drop off the trees from time to time and return by crawl- 

 ing up the trunks, has led to the quite general use of bands of 

 various materials upon the trunk to prevent the ascent of the 

 larva?. Tar has been quite generally applied for this purpose, 

 but it is objectionable as it does not remain effective long, so 



