550 



BACTERIOLOGY. 



Under favorable conditions in cultures spores are 

 developed in the bacilli. These spores are elliptical 

 in shape and about one and a half times longer than 

 broad. They first appear as small, refractive gran- 

 ules distributed at regular intervals, one in each rod. 

 As the spore develops the mother-cell becomes less and 

 less distinct, until it disappears altogether, the com- 

 plete oval spore being set free by its dissolution. (Fig. 

 72, Fig. 13, p. 47, and Fig. 17, p. 207). Irregular 

 sporulation sometimes takes place, and occasionally 

 there is no spore-formation, as in varieties of non-spore 

 bearing anthrax. 



FIG. 72. 



Spores heavily stained (in specimen red). Bodies of disintegrating bacilli 

 faintly stained (in specimen blue). X 1000 diameters. 



The anthrax bacillus stains readily with all the aniline 

 colors, and also by Gram's method, when not left too 

 long in the decolorizing iodine solution. In sections 

 good results may be obtained by the employment of 

 Gram's solution in combination with carmine, but when 



