294 



THE GROUSE IN HEALTH AND IN DISEASE 



and Davainea, may be present without any Bacillus coli appearing in 

 cultures from the liver. On the other hand, Bacillus coli may be present 

 in the liver, and yet one or other or both of the tapeworms may be absent. 



TABLE V. — Showing that the Presence of Hymenolepis in the Duodenum 



IS NOT EKLATED TO THE PRESENCE OF BACILLUS COLI IN THE LiVER. 



li. fnt. = Ji. enteritidis. 



The great numbers which both these worms may attain is almost un- 

 believable by one who has not seen them (PI. XLii., Figs. 13 and 14). Davainea 

 seems to be present in the intestine throughout the year. It might 

 appear not without significance that Hymenolepis, so numerous 

 from the spring to the autumn months, during which the greatest 

 mortality among Grouse takes place, is scarce or absent during the 

 winter, when the disease is quiescent. On the other hand, we liave 

 not observed any gross lesions in the neighbouring mucous membrane 

 the worst cases of infection with either of these worms, nor have 

 has already been shown, any relation to the presence of living 



The pre- 

 valence of 

 Hymeno- 

 lepis and 

 Davainea 

 in normal 

 and dis- 

 eased birds 



even 

 they. 



in 

 as 



intestinal bacteria in the tissues. We therefore are not inclined to belicA^e 



