120 Tuberculosis. 



at the time of the inauguration of the method and which continued 

 to contain reacting animals, included 375 herds of 21,899 animals, 

 with 41.5% of reactors. At the end of 1908 the number of cattle 

 had increased to 26,181, of which only 1,496, or 5.7% reacted. 



The results were not so pronounced when the reacting animals 

 were retained with the healthy animals, when cattle without the 

 necessary precautionary measures were placed in herds free of 

 tuberculosis, when animals which had not reacted in the old herd 

 were removed into the free herd without being previously tested, 

 or when an opportunity was given for the transmission of the in- 

 fection by a reacting bull causing the infection in the herd to ap- 

 pear to be renewed. Also in cases when the milk used for the feed- 

 ing of calves was not free from tubercle bacilli, the results were 

 unsatisfactory. 



In the interest of systematic eradication, it is necessary, espe- 

 cially at the commencement of the eradication work, to subject the 

 animals to the tuberculin test quite frequently, with short intervals. 



As a third group Regner included 436 herds containing 7,835 

 animals at the beginning of the work and 9,114 cattle in 1908, 

 which at the first examination, and again in 1908 were free from 

 reacting animals. 



The fourth group contains the herds which originally were 

 free from tuberculosis but were not so at the test in 1908. The 98 

 herds included at first 2,526 and in 1908, 3,720 animals, of which 

 265 or 7.1% reacted. 



Regner concludes from his tabulations : that on the first tuber- 

 culin test in 1366 herds, out of 49,112 animals tested, 14,175 or 

 28.9% reacted; that in 1909 the same herds contained 57,734 ani- 

 mals, of which 1761, or 3.1% reacted; that Bang's method is the 

 strongest factor in the general promotion of breeding, and of 

 stable and milk hygiene. 



In other countries the results were similarly favorable. 



Bang succeeded in Denmark, from 1893 to 1908, in gradually 

 reducing the percentage of reacting animals from 40 to 8 . 5. Malm 

 in Norway from 1896 to 1903 reduced the disease from 8.4 to 

 4.9%. Hojer in Finland in 1894 to 1900 caused the infection to 

 drop from 24 to 10.1%. 



Hutyra reports on experiments carried out on the government 

 farm of Mezohegyes. In this herd the first tuberculin test in 1898 

 showed 44.8% of reactors out of 329 cows or 26.6% of the entire 

 herd (647 animals), whereas in the fall of 1903 out of 502 cows only 

 2.8%, and out of the total of 1,132 animals only 1.8% reacted to the 

 tuberculin test. The herd had been increased in this period by 

 75%, without purchasing additions to it, and the percentage of 

 reactions had dropped 88%. 



The stringent measures of Bang have been somewhat modi- 

 fied in certain cases for economic reasons, or when the strict execu- 

 tion of Bang's method has presented peculiar difficulties. On the 



