134 BuivI<ETIN 65. 



ever these bacilli are contained in it. As the migrating bacilli 

 must be present in the blood before these secondary tubercles can 

 be formed by them in organs distant from the tubercles that gave 

 them birth, it follows that this infecting condition of the blood 

 must precede the formation of the secondary tubercle, or general 

 tuberculosis. While therefore it is quite true that the probabilities 

 of infecting blood are greatly increased when the tubercles are 

 numerous and generally diffused, it is an error to assume that the 

 restriction of the tubercles to one organ is a guarantee that the 

 blood is non-infecting. And when we cannot give a guarantee for 

 the blood we can give none for any part or organ in which blood 

 circulates. 



Danger from Flesh. 



It would seem as if the muscle or red flesh in cattle were antag- 

 onistic to the bacillus tuberculosis. Certain it is that tubercles 

 are rare in the substance of the muscle. They are, however, 

 very common in the lymphatic glands lying between the muscles, 

 and in swine they are common in the substance even of the red 

 flesh. The flesh of tuberculous pigs is therefore far more danger- 

 ous than is that of consumptive cattle. Even in tuberculous 

 cattle, however, the beef is not always free from bacilli as shown 

 especially by the crucial test of inoculating its juice. Arloing 

 tested 10 tuberculous cattle in this way by inoculating guinea- 

 pigs and found that the muscle from two of the cows only (20 per 

 cent.) proved infecting, and that only 3 of the 10 guineapigs 

 inoculated by the muscle juice of these two cows became tuber- 

 culous. Galtier fed two calves and two young pigs with the raw 

 flesh of a tuberculous cow, but failed to infect them. This fail- 

 ure was, however, not necessarily due to the absence of bacilli, 

 since two rabbits inoculated with juice from the same flesh con- 

 tracted tuberculosis. Nocard fed several litters of young kittens 

 on the flesh of cattle condemned as tuberculous, at the abattoirs 

 of La Vilette and Grenelle, but none of them contracted tuber- 

 culosis.* Perroncito fed 18 young pigs from three to five months 

 on the flesh of cattle condemned as tuberculous in the Naples 

 abattoirs, yet none became tuberculous. 



*By inoculation with the muscle juice of tuberculous cattle Nocard 

 infected 5 per cent, of the subjects of experiment. 



