182 



ESSENTIALS OF BACTERIOLOGY 



appeared, except near the point of entrance. This fact is 

 explained as follows: 



Toxins. Several toxic products have been obtained from 

 the cultures, and they are produced in the body and give rise 



Fig. 90. Bacillus tetani: cul- 

 ture four days old in glucose-gela- 

 tin (Frankel and Pfeiffer). 



Fig. 91. Six days' culture of 

 bacillus of tetanus in gelatin (deep 

 stab) (Frankel and Pfeiffer). 



to the morbid symptoms. These have been isolated, and 

 when injected singly, cause some of the tetanic symptoms. 

 Tetanospasmin, the most important for man. 



