EXPERIMENTS WITH TUBERCULIN ON NON- 

 TUBERCULOUS COWS. 



On October 28th, 1894, the following cows were set apart for 

 this experiment : two Holstein cows and one Jersey in full flow 

 of milk, being about six weeks after calving, and two dry, farrow 

 cows of common stock, one pointing to a Short- Horn ancestry and 

 the other to a Devon one. Meanwhile observations on the milk of 

 three other cows, two Holsteins and a Jersey, about the same 

 length of time after calving, afforded a fair comparison between 

 cows treated with tuberculin and others under similar conditions 

 but without such treatment. 



The first five cows to be tested with tuberculin, each received 

 in proportion to its size, a full dose of tuberculin weekly and the 

 temperatures were taken before the injection for the normal 

 standard and about every two hours from about the ninth to about 

 the twentieth hour after each tuberculin injection. 



TEMPERATURE. 



The tested animals were treated like the rest of the herd with 

 the single exception, that in order to take the temperatures, they 

 were tied up in the stalls for twenty-four hours on each occasion 

 for testing, while the others were at liberty under an enclosed shed 

 except when tied up for feeding and milking. The prolonged 

 standing on hard boards, led on each occasion to congestion of 

 the feet of the Holstein cow Mabel, which weighed 1455 lbs., 

 but as this invariably took place under similar circumstances and 

 apart from the injection of tuberculin, the slight rise of tem- 

 perature on each occasion of testing is abundantly accounted for 

 from the condition of the feet alone. This conclusion is further 

 confirmed by the fact that, excepting in cases in which she was 

 turned out in the afternoon to relieve her tender feet, the tempera- 

 ture went on steadily increasing to the last. This was notoriously 

 the case in the three last tests of the series (Nov. 28th, Dec. 7th, 

 Dec. 12th). On a previous occasion Mabel had been tested in 



