INJURIOUS INSECTS. lOl 



Place oil, resin and a gallon of water in an iron 

 kettle and heat until resin is softened ; add lye solu- 

 tion made as for hard soap; stir thoroughly; add 

 remainder of water and boil about two hours, or 

 until the mixture will unite with cold water, making 

 a clear, amber-colored liquid. If the mixture has 

 boiled away too much, add sufficient boiling water 

 to make five gallons. 



For use, one gallon of this stock solution is 

 diluted with sixteen gallons of water and afterward 

 three gallons of milk-of-lime or whitewash added. 

 The resin mixture is in reality a liquid soap, and the 

 addition of the lime turns it to a hard soap which 

 remains suspended in the water in minute particles. 

 The poison, one-fourth pound of Paris green or 

 other arsenite, is then added, and the particles of 

 poison adhere to the finely divided soap particles and 

 are thus distributed throughout the mixture in 

 minute and uniform quantities. The soap solution 

 is very adhesive and thus a thin film of poison is 

 made to stick to every part of the leaf which is 

 touched by the spray. The application must be 

 made by a hand power machine, either a strongly- 

 made knapsack, or a barrel sprayer, as no horse 

 power machine will do the work thoroughly enough 

 or carefully enough upon cabbage and cauliflower. 



Early Tests. — ^This resin-lime mixture received 

 its first test upon cabbages in 1896, though it was 

 used with perfect success against cabbage worms 

 upon smooth-leaved turnips in 1895. Not a living 

 worm could be foxmd upon the patch three days after 

 the spraying, and the protection was excellent, even 

 to the end of the season, notwithstanding heavy 

 rains. 



