14 



recover. Id windy weather the evaporation is also rapid, and the deadly 

 properties of the Buhach are lost, being blown away from the insect, in- 

 stead of being kept where the latter is compelled to breathe it. 



The following experiments with Buhach were made the past season 

 either by myself or where I was permitted to witness them in person: 



Tomato worms — the larva? of Macrosila Carolina, Linn. — sprayed with 

 a solution composed of one pound of Buhach stirred in ten gallons of 

 water were killed in a few minutes by it. When first sprayed they mani- 

 fested their dislike by jerking their heads and the forepart of the body 

 from side to side, at the same time emitting from their mouths a dark 

 greenish, semi-liquid substance, as almost every locust or grasshopper 

 will do when taken in the hand. The jerking gradually increased in 

 violence, until finally the worms let go their hold of the plants and fell 

 to the ground, where they wriggled around for a short time, and finally 

 expired. I am not aware that a single tomato worm treated with the 

 above solution recovered from its effects. 



The above solution appeared to have no effects upon a Bordered Squash- 

 bug (Largus succinctm). 



At about 4 o'clock in the afternoon a Twelve-spotted Diabrotica (Dia~ 

 brotica duodecim-punctata Fabr.) was immersed in a solution composed 

 of one and one-half pounds of Buhach stirred into five gallons of water j 

 it was still alive at 9 o'clock, but was dead when examined the next 

 morning. 



A horned beetle (Xotoxus cavicornis LeC.) was immersed iu the same 

 solution and at the same time as the above; it was still alive at 3 o'clock 

 in the afternoon of the next day, but was dead when examined the fol- 

 lowing morning. It became unable to walk about five minutes after it 

 had been immersed, and it remained in that condition, occasionally 

 moving a leg or foot, until it died. Another specimen was sprinkled 

 with the dry powder, but was not killed thereby; this would seem to in- 

 dicate that Buhach wetted so as to adhere to the insect is far more effect- 

 ive than in a dry state, even though it is diluted to a considerable ex- 

 tent with water. 



A black cricket (Gryllus sp.?) sprayed with the above solution in the 

 evening was dead the next morning. 



An Eleodes quadrieottis LeC. that had been rolled in the pure Buhach 

 was still alive eight days later, although it did not appear to be as 

 sprightly as it was before being treated with the powder. 



A siugle application of Buhach, either in a dry state or when mixed 

 with water or with alcohol, will not kill locusts or grasshoppers tbat 

 have been dusted or spraj'ed with it. When treated to the powder or 

 to either of the solutions they show signs of its effects in from ten min- 

 utes to half an hour. At first the hind legs are affected, and the in- 

 sects raise them over their backs and kick around for a short time, and 

 finally lose all control of them, crawling about by means of their four 

 anterior legs, and dragging their hind legs aftert hem. After a while 



