46 MODERN DAIRY PRACTICE. 



According to Bang, tuberculous milk coagulates at 

 75-85 C. In regard to tuberculosis in cows, it may fur- 

 ther be mentioned that not all glands in the udder are 

 necessarily attacked by the disease at one time. The 

 milk in the sound glands has in such cases been very rich 

 in fat, and reminded one of cream in its appearance.* 



milk will as a rule turn red litmus paper blue and blue litmus paper 

 red, i.e., give both an acid and an alkaline reaction. This double re- 

 action is explained by the presence of normal and acid alkaline phos- 

 phates and carbonates in the milk (Soxhlet). On standing even for a 

 short time, normal cows' milk has always an acid reaction. W. 



* The subject of bovine tuberculosis has been much discussed of 

 late among dairymen in all parts of the world, and its importance 

 has hardly been overestimated. The complete eradication of the 

 much-dreaded disease in our country is one of the great dairy prob- 

 lems of the age. Fortunately we have in the Tuberculin test a 

 ready and but rarely-failing means of discovering the disease even 

 when it is in its early stages. Breeders of dairy stock are now be- 

 ginning to sell their stock on a guarantee of freedom from tuber- 

 culosis, as shown by the test, aud dairy-farmers in buying new stock 

 should insist on such a guarantee in justice to themselves as well 

 as to their customers. 



Dairymen suspecting tuberculous animals in their herds should 

 not fail to isolate suspicious cases at once, and to call in a skilled and 

 careful veterinarian to make the test. For a preliminary examina- 

 tion of the cows the following schedule of manner of procedure 

 adopted by Danish veterinarians may be of service (see Woodhead, 

 "Bacteria and their Products," 1891, 225). 



a. "First of all the submaxillary glands are examined; these 

 are easily felt, and any change is readily made out. 



b. " The glands at the root of the neck and those in front of the 

 haunch bones are always carefully examined. The glands in the 

 flank should be equal in size about the size of the middle finger, 

 aud not hard. Mere enlargement, however, even when considerable, 

 is not looked upon as of great importance if it is perfectly equal 

 on both sides. 



c. "The animal is made to cough by means of pressure on the 



