1907.] Human and Animal Tuberculosis. 741 



with tuberculosis of human origin, the two investigations being 

 kept strictly separate, being conducted at places situated as 

 far as conveniently possible from each other, and each being 

 under the care of a qualified resident investigator. 



For this purpose the Commission accepted the very generous 

 offer made by Sir James Blyth, who placed at their disposal two 

 farms on the borders of Hertfordshire, about H miles apart, 

 comprising in both cases complete sets of farm-buildings, which 

 had not been used for cattle, and as much land as the Com- 

 mission desired to use. In addition to these two farms, Sir 

 James Blyth provided a house for the members and their 

 assistants, where a third laboratory was subsequently estab- 

 lished. 



The present Report deals with the experiments and inves- 

 tigations as to the effect of introducing the germs of human 

 and bovine tuberculosis into the bodies of bovine and other 

 animals, and the results already arrived at are summed up 

 as follows : — 



There can be no doubt but that in a certain number of cases 

 the tuberculosis occurring in the human subject, especially in 

 children, is the direct result of the introduction into the human 

 body of the bacillus of bovine tuberculosis ; and there also can 

 be no doubt that in the majority at least of these cases the 

 bacillus is introduced through cows' milk. Cows' milk con- 

 taining bovine tubercle bacilli is clearly a cause of tuberculosis 

 and of fatal tuberculosis in man. 



Of the sixty cases of human tuberculosis investigated by 

 the Commission, fourteen of the viruses belonged to Group 1., 

 that is to say, contained the bovine bacillus. If, instead of 

 taking all these sixty cases, attention is confined to cases of 

 tuberculosis in which the bacilli were apparently introduced 

 into the body by way of the alimentary canal, the proportion of 

 Group I. becomes very much larger. Of the tofal sixty cases 

 investigated twenty-eight possessed clinical histories indicating 

 that in them the bacillus was introduced through the alimentary 

 canal. Of these thirteen belong to Group I. Of- the nine 

 cases in which cervical glands were studied, three belong to 

 Group L, and of the nineteen cases in which the lesions of 

 abdominal tuberculosis were studied, ten belong to Group I. 



