452 WaLLAce LARKIN CHANDLER 
June 13 — The bird showing on June 12 the symptoms described, flew 
the length of the room along the floor, its head touching the floor. I!t 
probably had the use of its wings but could not direct the flying move- 
ments. The other bird showed symptoms of poisoning on this day. 
Both the birds were killed about noon, and the nervous tissues were 
fixed as described earlier (page 429). 
OBSERVATIONS OF THE ACTION GF NITROBENZENE ON INSECTS 
During the fumigation of the animals a number of external parasites 
dropped from the hosts. ‘These were collected at the end of the fumigation 
period and observations were recorded regarding the action of the drug 
on them. Some of these observations were as follows: 
‘FLEAS 
Eighty-three fleas of the genus Ctenocephalus were recovered from 
the bottom of the tank after the fumigation of Cat X (fumigated for 
five hours at 17° C.). Most of these began to show signs of life in about 
one and one-half hours; they were put into a glass tube and placed in 
a warm room, and in about twelve hours all the fleas had recovered with 
the exception of about one-half dozen, which were stuck fast to the tube. 
Nineteen fleas of the same genus were recovered in a stupefied coa- 
dition from the bottom of the tank after the fumigation of Dog I (second 
fumigation, six hours at 23° C.). Three of these showed signs of life, 
and most of them recovered during the next twelve hours. 
Seventy-six fleas of the same genus were recovered from the tank after 
the fumigation of three kittens for a period of four hours at 22° C. Some 
of these fleas showed signs of life when removed from the tank, and twenty 
of them recovered and lived for several days. 
BITING LICE 
A large number of biting lice (T’richodectes subrestratus) were recovered 
in a stupefied condition from the bottom of the tank after the fumigation 
of Cat X (fumigated for five hours at 17° C.). Neariy all of these recovered 
during the next twelve hours. 
A large number of the biting lice of poultry (Menopon gallinae, Menopon 
stramineum, Lipeurus heterographus, and Goniocotes gigas) were recovered 
