APPENDIX. xvii 



The spraying should be of such a character that there would be 

 comparatively little falling from the tree or shrub sprayed. 



Professor SHALER. Have you known of any cases of poisoning 

 in persons employed in spraying ? 



Professor RILEY. No", I have seen none, but I have known of 

 cases where negroes would sit on the back of a mule with spray- 

 ing pumps, going through cotton fields, and carelessly allow the 

 water to fall on them. I have known them to become sore in the 

 groin, but never knew of a fatal case. 



Mr. APPLETON. The spraying is washed off by the first rain, 

 of course? 



Professor RILEY. It should not be. The whole tree is en- 

 shrouded in a vapor which is all-sufficient, and which is more 

 effective than a more copious spraying. 



Professor SHALER. Is there any particular form of engine 

 which will give that form of spraying? 



Professor RILEY. There are various spraying devices in use, 

 depending largely on the height of the vegetation. If you want 

 to throw to any great height without the use of ladders, you need 

 a spraying device that will throw a strong jet. In almost all 

 cases you can use the cyclone nozzle in its Vermorel modification. 



Mr. SCUDDER. I should like to say before going that it does 

 not seem ty me likely that the thing will be exterminated, but 

 that it can be held in check for many years. The reason why I 

 don't think it can be exterminated is because we have not enough 

 persons used to looking for the caterpillars to examine the trees 

 and say for certain that there are none there. I do think, how- 

 ever, that it can be held in check. 



Selectman W. A. PEIRCE of Arlington said they had very little 

 trouble with it in his neighborhood. The sentiment of the people 

 there was in favor of the continuation of the work. 



Mayor WIGGIN of Maiden. "We went through and marked 

 every tree that was infested, and then went through again and 

 sprayed them. The trees were not so infested as to be particu- 

 larly noticeable. 



Mr. GOULD of Melrose. The selectmen did not believe there 

 were any gypsy moths in their town. As far as he knew, the 

 people were not disturbed by their presence. They would be 

 glad, however, to have the inspectors go through the town and 

 look for it, and would gladly second their efforts. 



Professor SHALER. I think it would be a tax of probably more 

 than one hundred thousand dollars annually if not checked. 



Professor RILEY. There is no question of that, if it is allowed 

 to take its course. That is what makes it so vitally interesting to 



