202 ANNUAL REPORT. 



from some of the shades, but was, in constitution, about the same 

 .as it is now. I wrote an article to the New York Tribune, ex- 

 plaining the destruction which it was to insects in this use of 

 kerosene. About two or three weeks afterwards I noticed some 

 of the limbs where I had applied the kerosene oil, and found it 

 had killed them and destroyed that part of the tree where I had 

 used the kerosene. I didn't like that part, but I thought those 

 who tried it would find it out for themselves. Kerosene oil is as 

 destructive as anything I know of for all insect life, as much so 

 as anything except the London purple. This dust is sold very 

 cheaply, and is prepared by the druggists, and is worth perhaps 

 75 cents an ounce. You can reach with it millions of insects that 

 fly, that you cannot reach in any other way. I have destroyed 

 the troublesome millers with it that are so fond of cabbage. 



Mr. Gideon. Is it a poison? 



Gen. Le Due. Not to animals. It is to insects. It brings on 

 convulsions. It is not poisonous to human beings. I use it in 

 my stable frequently where it proves very effectual. 



Mr. Gideon. In using kerosene, what proportion of water 

 would you use? 



Gen. Le Due. You want to use kerosene with milk and mix 

 with water. You want to make an emulsion and apply with a 

 syringe. We used it altogether in protecting the greenhouses in 

 Washington and were very successful. That was done with 

 water, but it led to experiments which resulted in the emulsion. 



Mr. Tuttle. I would say that that same remedy had been used 

 on the cranberry marshes for the worm. They used I think some 

 seventy-five barrels of kerosene on our marsh for the vine worm 

 this last season. I am satisfied that for anything that eats the 

 leaves as the vine worm does, I can destroy with ten cents worth 

 of arsenic as many insects as you can with a barrel of kerosene. 

 That amount of arsenic is enough for three barrels of kerosene, 

 and sufficient in strength to do thorough work. 



Mr. Whipple. Would you recommend the use of that on 

 cabbage f 



Mr. Tuttle. Well, no; I don't know as I would. In regard to 

 the codling moth I would say, that I have tried a great many 

 remedies, and I have destroyed more codling moths in a single 

 evening with a pan of vinegar than with any other trap I have 

 used. I have set out a six quart pan filled with vinegar and the 

 next morning have found it covered. 



Gen. Le Due. Is it possible? 



