174 BACTERIA IN DAILY LIFE 



the outside infected herd was removed to an isolated 

 part of the settlement. Having been previously con- 

 vinced of the futility of police cordons in the prevention 

 of cattle-plague, I was not surprised to find, within a 

 short time, that the' disease had spread, by the meeting 

 together of cattle-coolies at a common tea-house, to 

 three other dairies at a distance of a quarter, a half, and 

 two miles from the original source of infection. 



" As the animals are not, as a rule, taken away from 

 the immediate vicinity of the dairy, there being no 

 grazing fields, and as neither fodder nor dung is taken 

 from one dairy to another, it is practically certain the 

 infection was carried by the dairy-coolies. 



" Immediately on this second series of dairies becoming 

 infected it was resolved to apply the gall immunisation 

 method of Koch as being the means at hand. About 

 1,500 cubic centimetres were collected from the gall- 

 bladder of a rinderpest animal, and 10 cubic centimetres 

 were injected into the dewlap of each of the twenty 

 remaining cattle in the dairy. 



"The injection caused slight local swelling and 

 tenderness, but no constitutional symptoms and no 

 alteration in the milk-supply, an important matter in 

 a dairy. In all sixty-eight cattle were injected with 

 cattle-plague gall. Of these, seventeen were among iso- 

 lated uninfected herds ; the remaining fifty-one belonged 

 to infected herds, and among the latter eleven died of 

 - cattle-plague subsequent to the injection." 



Dr. Stanley points out that ten of these animals, 

 judging by the time which elapsed after the in- 

 jection, when they showed the first symptoms of 



