AGRICULTDRAL EXPERIMENT STATION. 129 



ed several times, has no- appreciable effect upon the productiveness 

 or health of the cow. This has also been the experience of nearly 

 all who have applied the te^t. Cows that have been tested suffer 

 from the same troubles that affect other cows and there is no 

 ground for connecting these troubles with the test that has been 

 made. 



In Bulletin No. 42 of the Vermont Agricultural Experiment Sta- 

 tion the history of tuberculosis in the Vermont State College herd 

 is given. The first of January, 1894, all but two animals out of a 

 herd of thirty-three were in apparent health. These two had been 

 in an unthrifty condition since coming from the pasture in the fall ; 

 tested with tuberculin twenty-four animals reacted and the post 

 mortem confirmed the test. Two animals that failed to react were 

 killed and showed no disease. In the same bulletin it is stated 

 that the station veterinarian during the first six months of last 

 year made over a thousand injections of tuberculin and two hun- 

 dred and twenty-two animals were found diseased. Two hundred 

 and twenty of these were slaughtered and found tuberculous. 

 Nothing is said about the other two. This is a very remarkable 

 record and does much to confirm the value of tuberculin in detect- 

 ing tuberculosis. Most of these cases were found in two badly 

 infected herds and of six hundred and sixty-two animals tested, 

 only thirty-nine cases of tuberculosis were found. In Bulletin No. 

 27 of the Massachusetts Hatch Experiment Station Dr. J. B. 

 Paige gives the results of his experience with tuberculin. The entire 

 college herd was destroyed at different times, the last of them in 

 January, 1894. At this time thirty-two animals were killed, 

 twenty-five of these reacted under the tuberculin test and were 

 found to be tuberculous. The other seven were sound. Of the 

 twenty-five tuberculous animals in no case had the ph3'sical symp- 

 toms so developed that by any ordinary examination a diagnosis 

 of tuberculosis could have been made. Among the conclusions 

 with which Dr. Paige closes his bulletin are these : 



"The diagnosis of most cases of this disease by physical exam- 

 ination is impossible." 



"That in tuberculin we have an exceedingly delicate and reliable 

 test for tuberculosis " 



"That in tuberculin we have the only means by which we can 

 eradicate tuberculosis from among our cattle." 



We might go on to almost any length in giving the results of the 

 use of tuberculin in detecting diseased cattle, and they would all 



