106 DISEASES OF POULTRY. 



Fig. 19. — Liver of healthy turkey. 



were other regions of the digestive tract found affected. 

 Associated with this disease of the csca, there is in 

 nearly all cases a more or less serious disease of the 

 liver. This organ is enlarged in proportion to the 

 amount of its tissue which is affected. It may be 

 twice the normal size, and over its surface are seen 

 roundish discolored spots, varying from one -eighth to 

 two -thirds of an inch in diameter. Some of these 

 spots are sharply defined circular areas of a lemon 

 yellow or an ochre yellow color. This yellow sub- 

 stance represents dead tissue. In other cases the spots 

 are whitish and shade off somewhat gradually into the 

 surrounding tissue. Another class of spots are of a 

 mottled brownish color, darker than the surrounding 

 liver tissue. These may have a central yellow nucleus 

 of dead tissue, and a narrow outer border of the same 

 character, or the border may be a dark brownish cir- 

 cular line. The entire spot has an indistinct appear- 



