102 



These are the principal features revealfd liv ;i [lost 

 mortem examiiialiou. The symptoms are lailier in 

 detinite because the disease does not follow a regular 

 course, so that a slightly affected turkey may present 

 certain symptoms, while one iu a more advanced stage 

 of the disease may present entirely different symp 

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

 connection between 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 affiicted, 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 arc 

 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. 



Yoiinii tnrkt^vs arc most 



The upper two-thirds of one 

 caecum is affected, also an area, as 

 near the union with the colon. 

 The other caecum is tbicltened ai 

 the points, b. The thickness oi 

 the affected ca-cal walls is shown 

 in section c. One third natural 

 size (Moore*. 



