452 



BACTERIA IN SURGICAL LESIONS. 



of the same nature as those injected, but more numer- 

 ous. . . . The cocci were living and growing, and a 

 drop of the matter injected into another animal pro- 

 duced the same results in it, and it on another animal, 

 and so on. No increased virulence was observable in 

 the transference through a series of animals. The red 

 infiltration around the abscess showed the micrococci 

 invading the neighboring tissues, penetrating between 

 their cells, and in colonies or chains, gradually decreas- 



Fig. 30. 

 Group of chain micrococci in pus. x 1600 (Ogston.) 



ing in size, pushing their way for a considerable distance 

 into the structures in the vicinity. . . . After five to 

 seven days had elapsed, and in some cases even earlier, 

 the animals exhibited a change. They became more 

 active again, threw off their lethargy, and seemed well ; 

 but at the spot where the injection had been made, there 

 was found a fluctuating tumor, gradually increasing in 

 size, and presenting all the signs of being an ordinary 

 abscess. When they were killed during this second 

 stage, micrococci were more rarely found in the heart- 



