138 



P. B. SIVICKIS. 



body; but since the pieces from different levels showed no great 

 differences in susceptibility, the data for all the different levels 

 were brought together in a single curve for each length of piece. 

 Consequently each curve of pieces in the graph, Fig. 24, represents 

 pieces from all levels — i.e., the whole body except the head cut into 

 fourths, sixths, or eighths. KNC w/ 1,000 was used as agent. 



40 e dc § 1/1J 



Hours 



Fig. 24. Graph showing changes in susceptibility following section. Each 

 curve except aa and bb represents all pieces from 50 animals, aa, 50 intact 

 animals, bb, 20 headless animals. Further explanation in text. 



Fig. 24 shows that susceptibility is greatly increased by section. 

 Uninjured, full-grown animals (aa) show the lowest susceptibility 

 of all. Removal of the head increases susceptibility (bb). In 

 fourths (cc), sixths (dd), and eighths (ee), immediately after 

 section, susceptibility is greatly increased, and it will be noted that 

 it is highest in eighths, somewhat lower in sixths, and lowest in 

 fourths. 



During the first fifteen to twenty hours after section the sus- 

 ceptibility of pieces decreases, then remains nearly stationary for 



