282 BACTERIOLOGY. 



made similarly with blood from the heart and exuda- 

 tions from the lungs, etc. In the last-mentioned the 

 bacilli are present in very small numbers, or alto- 

 gether absent. They should be examined both un- 



FIG. 105. BACILLUS ANTHRACIS, x 1200. From a preparation of blood from 

 the spleen of an inoculated mouse. 



stained and stained (p. 48). The rods are straight, 

 or sometimes curved, rigid, and motionless, and vary 

 in size in different animals. They stain intensely 

 with aniline dyes, and are then seen to be composed 

 of segments with their extremities truncated at right 



: 



FIG. 106. BACILLUS ANTHRACIS, X 1200. From a cover-glass preparation 

 stained with Gram's method and eosin. The light part of the rod 

 represents the sheath stained pink, and the dark part the protoplasmic 

 contents stained blue and contracted. 



angles ; between the segments a clear linear space 

 exists, which gives them a characteristic appearance 

 (Fig. 105). By double staining (p. 49), the rods are 

 seen to consist of a membrane or hyaline sheath 

 with protoplasmic contents (Fig. 106). 



