April, '15] ENTOMOLOGISTS' PROCEEDINGS 191 



ARSENICAL RESIDUES ON FRUIT AND GRASS 



By W. C. O'Kane, Durham, N. H. 

 {Withdrawn for publication elsewhere) 



Mr. E. G. Titus: I would like to ask a question in regard to the 

 weak animals, as I have had occasion to examine animals mth paraly- 

 sis, and it has often occurred to me that arsenical poisoning might 

 have something to do with the muscular weakness of these animals. 

 It usually occurs in either the fore or hind quarters. 



Mr. W. C. O'Kane: The poison is presumed to affect the nerve 

 centers, resulting often in paralysis of the extremities. The calves, 

 if they had been free, no doubt would not have eaten all the grass. 

 They hunted around the edge of the inclosure and tried to get fresh 

 grass. They would eat the sprayed grass freely at the start — ate it 

 promiscuousl}^ and then apparently acquired some discernment. 



Mr. H. a. Gossard: I would like to inquire whether anyone has 

 any data showing the effect of poison on suckling animals after the 

 mothers have feci on sprayed grass. I recollect an instance in which 

 suckling pigs had died, their mother having fed in a sprayed orchard. 

 The party making the report to me had inquired of a chemist who 

 stated there was danger of the poison being transmitted through the 

 milk, and while little injury was likely to result to the mature hog, 

 the suckling pigs might be injured. 



Mr. W. C. O'Kane: I do not know of any data in regard to 

 farm animals that is trustworthy. There are notes as to human 

 beings, especially in English reports of the death of l^abies that were 

 nursed by mothers who were receiving small amounts of arsenic. 



President H. T. Fernald : The next paper will be read by Leonard 

 Haseman. 



Mr. Leonard Haseman : This is of course not especially a Missouri 

 pest, but the cotton moth has attracted so much attention in Missouri 

 this year that I thought perhaps a few notes might be of interest to 

 some of the m^embers. Last fall the migration was much heavier 

 than previously. In the latter part of September the migration was 

 so heavy and the damage to fruit so great that we received a very large 

 number of complaints and requests for treatments. As is well known, 

 the cotton moth is able to break the skin of fruit, and it does this seem- 

 ingly by means of rudimentary jaws. On examining the mouthparts 

 of the cotton moth you will find that it has small rudiments of mandi- 

 bles. 



