February, '16] ENTOMOLOGISTS' discussions 79 



Mr. William Moore: It is not. With the dose used it would be 

 possible to have an oil stove in the same room. (Phial of nitro- 

 benzene passed around for inspection.) 



Mr. W. a. Riley: I should like to inquire whether the docility 

 of the cat when taken from the box was due to its being under the influ- 

 ence of the chemical? What effect does it have upon a dog? 



Mr. William Moore: It may have a more or less quieting effect 

 upon the animal. The cat is more sensitive to the nitrobenzene than 

 the dog, while the lack of oxygen in so small a box probably had an 

 influence. 



Mr. W. a. Riley: It is a paper of exceedingly great value in that 

 the compound may be applied under ordinary conditions. I wondered 

 if it was a question of applied psychology that as the paper started out 

 with the details of the poisonous effect of the chemical, attention was 

 focused on possible dangers of its use. 



President Glenn W. Herrick: I have been very much interested 

 in the paper. We have been doing some work at Cornell on the use 

 of paradichlorobenzene for some subterranean insects. Mr. Hawley, 

 a graduate student, has been working along these lines with the white 

 grub. I have been intensely interested in this project. 



I should like to ask, have you arrived at any idea concerning the 

 quantity one should use? 



Mr. William Moore: Under ordinary conditions probably two 

 or five drops will be sufficient to saturate 1 cubic foot of air and make 

 allowance for absorption by the wood. By saturating a cloth with 

 nitrobenzene and tacking it in the box it will saturate the air suffi- 

 ciently for effective treatment, during the night. 



Mr. W. C. O'Kane: What is the effect on plants? 



Mr. William Moore : In greenhouse fumigation it is not effective. 

 You can saturate the air and kill the insects but it injures the plants. 

 I might say that we are getting results with paradichlorobenzene. 

 We have fumigated grain without injuring germination, in fact some 

 grain so treated germinated more rapidly. 



Mr. W. C. O'Kane: What are the results on insect eggs? 



Mr. William Moore: I do not think it will destroy them. 



Mr. George A. Dean: In your discussion you spoke of the nitro- 

 benzene as hastening the germination of the seeds. I should like to 

 know whether you have carried on any experiments or have any data 

 as to the repellent properties of nitrobenzene. The reason that I 

 ask this is because in Kansas, where we are carrying on experiments 

 for the control of the kafir ant, we are trying to find some substance, 

 with which the seed can be treated, that will act as a repellent and 

 not injure the germination. I might say that we have found that one 



