OF THE STATE ENTOMOLOGIST. 53 



tember, and it is barely possible that, by bein^ forewarned and fore- 

 armed, the farmers succeeded in eradicating the evil; especially if, as 

 I believe, the arrival of the pest at a point so fa,r east was premature 

 and artificial. Had its appearance in Lancaster county been the 

 result of its gradual spread, we should first have heard of it in the 

 intervening western counties of the State, and it would have been 

 beyond human power to stay its irresistible march. But all tlie evi- 

 dence points to its transportation with some cargo, on the railroad. 



The southern columns have extended somewhat east of Louisville 

 in Kentucky, for they were abundant around Ilarrodsburgh, in Mercer 

 county, as I learn from Jas. B. Clark, editor of the People of that 

 place. 



These are the only trustworthy records of its eastward progress 

 vt'hich have come to my knowledge ; for though other reports have 

 been made, there is no more proof that some other insect was not 

 mistaken for it than there is in the statement in the monthly report 

 of the Department of Agriculture for July, that it was found in one 

 county in each of the States of Virginia, North Carolina, Alabama 

 and Tennessee — a statement evidently loose. 



With regard to the safety of the 



USE OF PAIJIS GREEX, 



Prof. W. K. Kedzie, of the Michigan Agricultural College, has made 

 some interesting experiments. In a paper read before the natural 

 history society of the college, he showed how the green was insoluble 

 in pure water, and that where water was charged with carbonic acid 

 or ammonia, the very small portion that is dissolved is quickly con- 

 verted into an insoluble precipitate with the oxide of iron which exists 

 in our western soils. He shows just as conclusively that there would 

 be great danger in using pure arsenic — even were it as effectual as the 

 green — for the reason that it is soluble to such an extent that it could 

 not be neutralized by the oxide of iron in the soil. 



Prompted by the report from the Department of Agriculture, to 

 the effect that peas planted in soil mixed with the green rotted im- 

 mediately, I made the following experiment with peas and the mix- 

 ture of one pai:t green, twenty flour : I planted five ro vvs of peas, using 

 no green on the first, a little on the second, and increasing the amount 

 on the others, so that on the fifth the peas had, in addition to that 

 mixed with the soil, a covering of about one-eighlh of an inch. The 

 peas all grew and bloomed without noticeable difference, and were 

 finally eaten by a cow. 



^'EW ENEMIES. 



So little troublesome was this DorypJiora in my own neighbor- 

 hood, that, with other more pressing duties, I paid little attention 



