POl'LTRV DISKASKS AND TlllvIR TKICA'IM KN'I'. 



6r 



of the possibk- presence of the (Hseasc. Aforsc sa)s: "At the 

 post-mortem exaniinati(in you may have your suspi- 

 cions strengthened Ijy finding fiver, spleen, intestines 

 and membrane uniting the intestinal folds (mesenteries) 

 studded with \'ello\vish white cheesy nodules of various 

 sizes," ( )utside of the bacteriological test these post-mortem 

 findings are the best 

 proof of the disease we 

 have. The liver is af- 

 fected in nearly every 

 case of fowl tubercu- 

 losis. However, as has 

 been pointed out many 

 times in these pages, a 

 spotted condition of 

 the liver is no sure sign 

 of tuberculosis. Most 

 of tfie other liver dis- 

 eases of fowls cause a 

 simple blotching of the 

 tissue in which the 

 center of each spot is 

 usually depressed or 

 at least only slightly 

 raised, ( Cf. Fig. i, p. 

 54 ) . In tuberculosis 

 the liver is covered 



Fig-. 



3. Li\'cr of fowl affected with 

 tulRTCuld.sis. (.»\ft(.-r Ward). 



with numerous raised nodules varying greatly in number and 

 size as shown in fig. 3. A section (.if the liver shows these 

 nodules or tubercles distributed throughout the tissue. 



Still UKjre conclusive evidence is 

 found if the spleen is covered \vith 

 these same kind of nodules. The 

 spleen in health is a small i-ounded 

 purplish organ about \^2 inch in 

 diameter. It lies just aljove the 

 liver in the region of the gall blad- 

 der. In cases of tuberculosis it is 

 very frequently gi'eatly enlarged 



Fig. 4. Spleen from tuber- 



culous fowl cut through aj^(i i^ studded throughout with the 



the middle. (After Koch n ■ 1 , ■. ^ 1 1 . 



, „ ,. . ,, veUowisli-wliite tubercles as shown 



and Kaninowitsch ). 



in hg. 4. 



