TUBERCULOSIS 95 



10 tuberculous horses, all reacted : of 23 

 normal horses, none. Among swine and goats, 

 the results were no less decisive. 



4. In our great cities, the milk-supply is 

 regularly tested, lest it should convey the 

 germs of tubercle. In London, for instance, 

 samples of milk are sent, by order of the 

 London County Council, to the Lister Insti- 

 tute. The milk is put on a centrifugal machine ; 

 and a few drops of the sediment are put under 

 the skin of a guinea-pig. If the guinea-pig 

 shows signs of tubercle, it is killed and ex- 

 amined, and the infection is traced back to its 

 source. 



5. It has been proved that the sputa, dried 

 and blown about in dust, are capable of con- 

 veying infection. The general recognition of 

 this fact has led to the enforcement of rules 

 against spitting in public places, and to the 

 adoption of other sanitary measures to prevent 

 the spread of the disease. Especially, it has 

 been made compulsorily notifiable : not only 

 consumption, but surgical tuberculosis, must 

 be notified : so that all necessary disinfection 

 of premises, and protection of small children 

 against infection, may be taken in hand. 

 Forty years ago, any proposal for the com- 

 pulsory notification of phthisis would have been 

 met with a storm of ridicule. 



