A STUDY OF THE BOAS-OPPLER BACILLUS 



439 



The progressive amount of acid formed is shown in the follow- 

 ing table : 



The amount of acid formed by the different strains is remark- 

 ably uniform and the rate of acid formation nearly the same 

 in the first three samples. The strain from infant's feces is 

 somewhat slower in acid formation than those from pathological 

 conditions. 



In maltose broth the strains P, S and F produced no change 

 in reaction, while the strain from infant feces produced 4 per 

 cent normal acid or 0.36 per cent lactic acid in five days at 37°C. 

 and the same amount in two days at 44°C. 



The strain from carcinoma lost its power to coagulate milk 

 after seven transfers. We are unable to give an explanation 

 of this phenomenon, unless it was due to enfeebhng of the 

 organism. 



We foimd typical lacto-bacilU in the decayed contents of the 

 four teeth. In one of the teeth (sample 10) long bacilli forming 

 filaments and showdng granular staining were found in large 

 numbers. A few streptococci were also present. In one of 

 the pyorrhea cases (sample 11) the bacilh were somewhat shorter 

 than in the previous case. There were some that stained solidly, 

 while others showed distinct granular staining. In the second 

 pyorrhea case (sample 12) the long form was prevalent and 

 filament formation was common. The fourth tooth (sample 13) 

 was decayed and an ulceration was present at the root. The 

 lacto-bacilH present were rather slender, the granular staining 

 form being prevalent. Streptococci were also numerous. In 

 the cultures obtained from two of the teeth (samples 10 and 13) 



