112 Agricultural Bacteriology. 



the windpipe, and close to the intestine are usually the- 

 first to be affected. In making a post-mortem examina- 

 tion of the suspected animal, the parts that should be 

 examined are the lungs, the lymph glands mentioned 

 above, liver and the spleen. 



The tubercles vary greatly in size, from a pinhead to 

 the size of a hazelnut or walnut. When opened, the 

 smaller tubercles are usually of a light gray color 

 throughout, or may show at the center a yellowish spot. 

 The larger tubercles will usually contain yellowish: 



FIG. 12. TUBERCULOUS OMENTUM. 



The omentum, a" membrane of the abdominal cavity, 

 is normally smooth and thin. It is here studded 

 with masses of small tubercles. From a gener- 

 alized case of bovine tuberculosis. 



material and in many of the organs, as in the liver r 

 spleen, and lungs, tubercular abscesses of varying size- 

 may be formed. Some of the lymph glands become 

 very greatly enlarged. They may be filled with creamy 

 pus, or with a hard, gritty, yellowish substance, which 

 is produced by the accumulation of lime salts. On ac- 

 count of the yellow granular appearance, the contents 



