February, '16] 



MOORE; FUMIGATING ANIMALS 



77 



foot, while at 40° F. only about one-tenth of a drop will be held by' a 

 cubic foot of air. 



Probably most of the results cited in 'the early portion of the paper, 

 on the poisoning properties of nitrobenzene, were due to what might 

 be termed super-saturated atmosphere in which the nitrobenzene was 

 condensed as tiny particles in the air. In all of our later experiments, 

 the nitrobenzene was allowed to evaporate from a cloth and not evapo- 



Fig. 6. Curve showing amount of nitrobenzene in grams to saturate an atmosphere 

 at various degrees centigrade. 



.1369.5 drops of Ce H5 NO2 at 40° F. per cu. ft. 

 .262944 " " " " " " 50° F. " " " 

 .350592 " " " " " " 59° F. " " " 

 .47808 " " " ." " " 68° F. " " " 



yrroQO'-^ (( << << << u u 77° Tf << " " 



1.0956 " " " " " " 86° F. " " " 



rated by heat. In the experiments cited from other authors, in most 

 cases, the vapor of nitrobenzene was used, heat being applied to obtain 

 it, and under such conditions probably as much as a drop would be 

 contained in a cubic inch rather than a cubic foot. Although one can 

 successfully fumigate chickens by an exposure of ten to twelve hours, 

 by evaporating the nitrobenzene from a damp cloth, the same exposure 

 to a super-saturated atmosphere obtained by evaporating the nitro- 

 benzene by heat will kill the chickens, producing paralysis. The 



