JOURNAL OF ECONOMIC ENTOMOLOGY 
158 
[Vol. 17 
that in no problem with which I have been connected during the past 
ten years has a better spirit of cooperation existed. 
For the information of those who are not familiar with the circum¬ 
stances, frequent visits during the past few years have been made by 
the various officials to each other’s laboratories and all connected with 
the problem are or should be fully conversant with all the findings. 
Even manuscript has been exchanged previous to publication—quite 
an unusual feature—and parasites have been received through the 
courtesy of the U. S. Bureau of Entomology and liberated on a jointly 
conceived plan. That differences occur in the results obtained from 
certain control measures is natural but no doubt should exist in any 
one’s mind that these variations are known and fully recognized by 
every one connected with the problem. 
Mr. H. G. Crawford: I deeply regret, with Mr. Treherne, that 
there should be the slightest feeling abroad that there was not the 
most complete cooperation between the United States and Canadian 
investigations. Mr. Treherne’s remarks can have left no doubt upon 
that point and I most heartily endorse everything he has said. 
However, I can see some justification for a feeling that the recom¬ 
mendations arising from the results of our several investigations differ 
markedly. This arises from the fact that the work is being carried on 
under vastly different conditions. The Arlington investigations are 
proceeding under conditions of extreme complexity, where the insect has 
two broods and where corn is really responsible for but a small proportion 
of the borers present. The Ontario conditions, on the other hand, are 
relatively simple. There the insect is single brooded and corn is as yet 
the only real host plant. Thus fall ploughing in the two zones, for ex¬ 
ample, is affecting larvae of very different ages and naturally enough 
with different results. This is, of course, understood by those directly 
engaged in the work through the exchange of information, but may 
very easily not be realized by others in listening to progress reports. 
This feeling is intensified by the incomplete nature of the studies and a 
failure upon the part of the investigators to sufficiently stress the peculiar 
conditions obtaining in the area in which the work was carried on. 
The whole-hearted aim of the various investigators is to work out a 
practical control of the widest application possible in the shortest space 
of time, and to this end the very fullest reasonable exchange of informa¬ 
tion and results of work accomplished is carried on between the various 
investigations. 
Mr. Lawson Caesar : I should like to ask Mr. Parks his reason for not 
