326 BOARD OF AGRICULTURE. [Pub. Doc. 



on the outside leaves of the plant, where most of the cater- 

 pillars occur, and these leaves are never cut with the head. 

 Chemical analysis of heads heavily sprayed one week before 

 cutting showed that not a trace of arsenic remained. Finally, 

 if spraying be carefully done when the caterpillars first appear 

 in spring and followed up until the head appears, the insect 

 will in all probability be so reduced in numbers that spraying 

 after the head is a quarter grown will be unnecessary, thus 

 removing the last possibility of danger. 



This treatment for the cabbage worm is the usual one among 

 some of the largest market gardeners in the country, and no 

 case of arsenical poisoning from eating cabbage treated in 

 this way has ever been reported. 



Other substances, such as alum, copperas and saltpetre, 

 have been recommended for use against this insect, but are 

 of no value. 



Recently a new treatment has been brought forward by 

 the New York Agricultural Experiment Station, as being 

 better than that recommended above. The material used 

 is known as the resin-lime mixture, and is prepared as 

 follows : — 



Stock solution : — 



Pulverized resin, 5 pounds. 



Concentrated lye, 1 pound. 



Fish or any cheap animal oil, except tallow, . . 1 pint. 



Water, 5 gallons. 



Place the oil, resin and one gallon of hot water in an iron 

 kettle ; heat till the resin is softened, then carefully add the 

 solution of concentrated lye (prepared by the directions for 

 making hard soap always given on the can) ; stir the mixt- 

 ure and add the other four gallons of water, hot ; now boil 

 till the mixture will unite with cold water and make a clear, 

 amber-colored liquid ; now add water enough to make up 

 five gallons. 



With this as a stock solution, to spray, take : — 



Resin lime prepared as above, .... 1 gallon. 



Water, 16 gallons. 



Milk of lime, 3 gallons. 



Paris green, 1-4 pound. 



