No. 4.] FEUIT GROWING. 171 



There are among those insects some that I do not know. I 

 have them now in winter quarters, passing the winter in the 

 pupa stage ; and when they emerge next year, if I succeed 

 in carrying them through, I hope to be able to tell what 

 they are ; and then, when I get the names of them, I can 

 look into the literature of the subject and find what other 

 people have learned about them ; and, if any of them are 

 unknown, I shall try the thing over again, because so much 

 money is invested in this industry that I think it expedient 

 to spend time over this work, going slowly and thoroughly. 



The essayist has alluded to my experience with the bud 

 moth, and it may interest you to know that it took me ten 

 years to work out the life-history of that little insignificant 

 insect. Every year I would get round to a certain point, 

 but there was one link in the chain of its life-history that I 

 lost. It is a European insect, and it had been worked out 

 there, but they had made a mistake in it by some means. It 

 was supposed that it had been accurately done. I tried it, 

 following out the plans which the German entomologists had 

 adopted when they had worked upon it, but I lost the life- 

 history at one point, and upon that link hinged the question 

 how to destroy them. That was a necessary point, and I 

 never got it until I threw aside all previous investigations. 

 When I started from the first, as though nothing was known 

 about the insect, I found out just how and where it passed 

 the winter, and, knowing that, I could at once determine 

 how to destroy it. 



May I speak, Mr. Chairman, of some other experiments 

 which I tried with Paris green ? 



The Chaieman. Certainly, sir. That is directly in line 

 with the question which we have under discussion. 



Professor Fernald. It has been my experience that, 

 when we work out the life-history of an insect to find the 

 most available point where we can destroy it, we find that 

 what is true of one insect may not be true of another. 

 There was a question in regard to how much or how little 

 Paris green would be required to destroy an insect when it 

 is in the caterpillar stage. This past summer I took the 

 common tent caterpillar, because that is about as healthy an 

 insect as I know of, and it is about as abundant as anything 



