40 
findings on other animals. Thus a tiger (Felis tigris) 
showed but a few (6) ascarides at autopsy, whereas the 
keeper had found many in the cage in the dejecta just 
before death. Swift Fox (3239) was known to have 
hookworms during life, the ova being repeatedly found 
in the feces, yet no worms were discovered at autopsy, 
even where specially searched for. Swift Fox (3268) 
had similarly shown ova antemortem, but at autopsy 
only one hookworm was found, and this only by straining 
the intestinal contents and after diligent search. The 
latter circumstances were repeated to the letter in the 
case of Red Fox (3306). 
As a result of the findings in the Swift Fox first men- 
tioned, the feces of all the Canidae were examined for 
parasites with the following results. Hookworm ova^ 
or the living motile larvae thereof, were found in the 
dejecta of two Red Foxes, two Swift Foxes and a Prairie 
Wolf. (The last was not on exhibition.) In addition 
the sporocysts of Coccidium higeminum Stiles, were found 
in the feces of the two Swift Foxes and the imago of 
sarcoptes in the feces of the Prairie Wolf. The Swift 
Foxes were isolated with the results given later under 
heading of Coccidium higeminum. One died shortly^ 
the other about two weeks later. Attempts to treat the 
Red Foxes by thymol were unsuccessful, the animals 
dying shortly after being restrained. The Prairie Wolf is 
still in isolation. With the exception of this animal, 
then, all of the Canidae infested with hookworms have 
come to autopsy. That this is a serious malady is 
proven by the experience of veterinarians with hunting 
dogs, and of fox breeders on Prince Edwards Island. 
The observations of living hookw^orm larvae in freshly 
passed feces is of some hygienic importance. The 
human species must lie in sand for several days before 
hatching and attaining infestive power. The canine 
species has evidently a shorter incubation period and 
infestation ought to occur more easily, and therefore more 
extensively than it has. I think that the prompt re- 
moval of dejecta and the cement floors have prevented 
