152 



with equally immature Ascaris taken from pigs gave no determinable 

 difterences. These remarks presuppose that A. lunibricoides of man 

 and A. suiUa of swine are identical si)ecies. The description seems to 

 be incomplete, but as the species is neither peculiar to nor commonly 

 found in sheep no attempt is made here to enlarge it. The species can 

 easily be determined by a comparison with the 6gures. 



Sheep probably acquire this parasite while pasturing after swine. 

 As few are infected, little harm is accomi)lished by the Ascaris. It is 

 more abundant in summer and fall than at other seasons. 



