EFFECTS OF TUBERCULIN ON TUBERCULOUS COWS. 165 



12x3x2 inches. One of the pharyngeal glands was fully seven 

 inches in diameter and consisted of a very thin walled abcess 

 filled with thin, watery pus. This would account for the dim- 

 cult breathing. The lung tubercles had cheesy centers. 



Mina D. She had never shown symptoms of disease except 

 slight unthriftiness. Tubercular lesions were found in one 

 inguinal and in many of the mesenteric and mediastinal lym- 

 phatic glands and both lungs. t Tubercles in lungs were scat- 

 tered and not large, except one which measured 5x4x4 inches. 

 All the diseased tissue was somewhat cheesy. 



Kate. Had always been well. The only lesion found was one 

 cheesy, mediastinal gland, one inch in diameter. 



Trilby. Has show no symptoms of disease. The only lesion 

 found was one mediastinal gland with cheesy center. 



Topaz. Had always appeared to be well. Two mediastinal 

 glands were enlarged and cheesy. One measured 4x3x2 inches 

 and the other 2x1x1 inches. 



A study of these cases shows us, that, kept under exception- 

 ally good conditions as these cattle were, five of them kept the 

 disease in check, so that it made practically no advancement. 

 In the case of three others, but little advance was made, while 

 in two cases the disease had nearly reached a fatal termination 

 when the animals were killed. On the whole, w r e cannot see 

 that the exceptionally good care that these animals received 

 had any effect on the progress of the disease. It may have 

 retarded the progress of the disease, but if so the fact is not 

 sufficiently clear to lend much weight to the argument that 

 tuberculosis can be successfully controlled by simply maintain- 

 ing animals under good hygienic conditions. Twenty per 

 cent of deaths is probably as high a percentage as one could 

 reasonably expect among ordinary tuberculous herds kept under 

 poor or only fair hygienic conditions, if to begin with all cases 

 that presented any physical symptoms of disease were removed. 



The most of these animals were giving milk during quite a 

 part of the time, and their milk was fed to calves and pigs. The 

 pigs were fed some meal, and the calves had a little hay, but 

 their principal food was milk from the cows. Four pigs and 

 fifteen calves in all were fed with milk from these animals. The 

 pigs were killed when they weighed about 175 pounds and the 



