II 



The second class includes those that are not tuberculous 

 but which show an elevation of temperature as a result of : 



ist. Gow being with calf and within a month of calv- 

 ing. 



2nd. Cow being in heat. 



3rd* Such diseases as Imflammation of the Lungs, 



Intestines, Womb, Udder, Abortion, Retention of Afterbirth, 



Indigestion. 



4th. Improper stabling, unhygienic surroundings. 

 5th. Any change in the method of feeding, watering, 



or stabling of the animal during the test. 



Still, in spite of all these errors, the results of thousands of 

 tests show that in less than 3 per cent, of the cases tested do 

 thfcse failures actually occur. 



In the first class of cases, the error of diagnosis may be 

 reduced/to a rdinimum by careful examination ; and if the 

 animal has befen subjected to a previous test by tuberculin 

 within the past four or six weeks, then the amount of the 

 tuberculin injected should be increased to twice or three times 

 the standard aruount, and the teniperature reading noted every 

 % to i hour after injection, and continued for 19 or 20 hoUrs. 



In the Second class of cases, error can be avoided hf 

 throwing out the conditions named above. Then in reading 

 " after temperatures," it is advisable not to recognize as a reac- 

 tion an elevation of temperature less than t}^° or 2° I^., dir one 

 which at the same time does not go above 103.8° F.,atid the temper- 

 ature curve must have the characteristic curve. A fresh Jirep- 

 aration of tuberculin must be used and an accurate, self-regis- 

 tering theirmometer, and the thermometer must be retained in 

 the rectum from two to four minutes. A good aseptic syringe, 

 with a strong, sharp needle, that will hold a sufficient amount 

 of the tuberculin must be used. Then, when the veteritiary 

 makes the post mortem examination, have him especially 

 examine the lymph glands. 



If these points are carefully carried out, ertors will become 

 less and less in establishing the presence of Bovine tuberculosis. 



Mohler, in the 24th Annual Report of the Bureau of Animal 

 Industry, sayS : " That the low percentag;es of failures being 

 the case, cattle owners should welcome the tuberculin test, nbt 



