TWENTY-FIRST ANNUAL MEETING. 



213 



is undeniable that it must be the uniform arsenical that was 

 doing it. 



Dr. Clinton : Did you try the different sprays as many 

 times without the poison as you did with the poison? 



Dr. Stewart: No. 



Dr. Clinton: Weather conditions have a great deal to 

 do with spray injury. You stated that the injury on the 

 checks was due to the accidental treatment. Was it a 

 winter treatment? 



Dr. Stewart: No, it was summer treatment, but it got 

 on there before we got ours well started. 



Dr. Clinton: Probably your weather conditions there 

 had something to do with it. It seems to me that what 

 Dr. Stewart has brought out is largely true, but at the 

 same time you can get some injury from lime and sul- 

 phur without the arsenate of lead in it, and this past year 

 there was even a little scald injury in Connecticut on trees 

 that had not been sprayed at all. 



Dr. Stewart : My whole contention is based on this 

 proposition, that we get an injury of the same character 

 when we use a certain arsenical with four different fungi- 

 cides. That is the important thing. The injury was the 

 same. The ordinary mixed lead arsenate was the only com- 

 mon material, and that common material produced the com- 

 mon injury. 



Dr. Clinton : I think you are correct, or largely so. I 

 have gotten injury w^ithout any arsenate of lead at all, 

 but it has been much less conspicuous. 



Dr. Stewart: We are agreed perfectly about that. 



Dr. Clinton: With arsenate of lead used alone, did 

 you get any injury? 



Dr. Stewart: We did not get the injury with arsenate 

 of lead except in that last plot I showed you. That is the 

 only opportunity that we have had to test that point. We 



