102 



Tliese ar«' tin- |>rinci|>al featurcfs revc^alcd l».v a post 

 inoi'tem exaiiiiiiatiou. Thv syiupluins are lather iii- 

 deliiiite because the disease does not follow a regular 

 course, so that a slightly affected turkey may present 

 certain symptoms, while one in a more advanced stage 

 of the disease may present entirely different symp- 

 toms, that may be so different from the first that no 

 connection betvAeen the cases would be suspected by 

 an ordinary observer. It 

 has been noticed by those 

 who have investigated this 

 disease, that turkeys fre- 

 quently appear to recover 

 from it; this is, after having 

 been afflicted, sometimes 

 quite seriously, they pick up 

 in condition thereafter and 

 apparently recover, but a 

 post mortem examination of 

 these fowls will show dis- 

 tinct evidence of the disease. 

 The walls of the caecum are 

 still thickened, the spots in 

 the liver remain, and a mi 

 croscopical examination of 

 the contents of the caecum 

 reveal the living parasite of 

 the disease, so that these ap 

 parently recovered birds 

 continue as sources of infec 

 tion and can convey the dis 

 ease to other fowls. 



^'onng turkeys are most 



C.4!:cA OF Turkey Showing Ef- 

 fect OF Protozoan Disease. 



The upper two-thirds of one 

 Cci'cum is affected, also an area, as 

 near the union with tlie colon. 

 The other ciecuin is thickened at 

 the points. I). The thickness ol 

 the affected cn-cal walls is shown 

 in section c. One-tninl natural 

 size (Moore I. 



