192 



whose publication lias raised the hope that the dead line is to be 

 effective. Possibly Dr. Crowell can tell us something about it, 

 or some other member of the Department. 



THE CHAIRMAN: That would be eminently proper under 

 the rule guiding us at the presene time. We would be glad to 

 here from Dr. Crowell for three minutes, and extend the time, 

 if the Conference desires; either Dr. Crowell of Professor Col- 

 lins will speak. 



PROFESSOR COLLINS: Mr. Besley made the remark, I 

 do not remember whether it was this morning or not, that he 

 would like to have some positive statements. I am prompted to 

 say a few words about -the matter. I should have said them 

 before, only the discussion seemed to be so close on to the time 

 limit that I thought perhaps a little more favorable opportunity 

 might occur later. 



In reply, if we can regard it a reply to the question of Mr. 

 Besley and Professor Smith, I would like to say a few words in 

 regard to the cutting-out experiment around Washington. You 

 must remember that in the Farmer's Bulletin which has been 

 published, the statement is made that those experiments were 

 conducted chiefly by the senior writer, which is Dr. Metcalf. 

 We are all sorry that he cannot be here to tell you more about 

 this. Unfortunately I have visited only a few of these places 

 personally. Here is a statement, however, which I would like 

 to read in connection with that: 



In Farmer's Bulletin 467, p. 11, we made the following state- 

 ments regarding certain experiments which had been performed 

 at that time to test different methods of controlling the disease 

 by cutting out advance infections : 



"The country within approximately thirty-five miles of Wash- 

 ington, D. C. was chosen in the fall of 1908 as preliminary ter- 

 ritory in which to test this method of control. This section has 

 since been gone over fairly thoroughly once a year. As will be 

 seen by Fig. 1, fourteen points of infection were located and the 

 infected trees destroyed. Most of this work was done by the 

 senior writer. The largest infection was a group of nursery 

 trees that had been imported from New Jersey; the smallest, a 

 single lesion on a small branch of a large forest tree. In one 



