LIFE HISTORY OF ASCARIS LUMBRICOIDES. 45 
Immature stages of a nematode resembling and probably identical 
with Ascaris anoura have been found in the lungs of a python, indi- 
eating that this species, like Ascaris lumbricoides and Belascaris mar- 
ginata, migrates through the lungs, reaching, however, a more ad- 
vanced development before moving into the alimentary tract. 
The larve of Hamonchus contortus ingested by guinea pigs can 
be found in the lungs 2 days later, indicating the possibility that 
this species migrates through the lungs before finally establishing 
itself in the alimentary tract. 
Migration of the larve through the lungs is probably a common 
occurrence in the life cycle of nematodes whose adult stage occurs in 
the alimentary tract. 
Stewart’s observations as to the migration of Ascaris larve through 
the lungs have been confirmed, but his suggestion that rats and mice 
act as intermediate hosts is not tenable. No intermediate host is 
necessary, and human beings and pigs become infected with Ascaris 
as a result of swallowing the eggs of the parasite, and not as a 
result of swallowing food, water, or other substances that have been 
contaminated by the feces of rats or mice. 
ee BIBLIOGRAPHY. 
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1883.—Helminthologische Notizen <Verhandl. d. k. k. zool.-bot. Gesellsch. 
in Wien (1882), v. 32, pp. 189-142, pl. 12, figs. 1-14. 
EPSTEIN, ALOIS. 
1892.—Ueber die Uebertragung des menschlichen Spulwurms (Ascaris 
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