CHAP, ix] BACILLUS 165 



The protoplasm is either uniformly stained, or, as is not 

 uncommon, shows at the ends of each rod much deeper 

 staining than in the middle — that is to say, there is denser 

 protoplasm at the ends of the rods than in the middle. In 

 the short individuals this often gives a very characteristic 

 appearance, inasmuch as each rod appears made up of three 

 parts of equal size : two terminal stained granules and a 

 middle clear unstained part. As just stated, this is not 



* • i '^ 



4%" 



^- 



Fig. 41. — Bacillus Subtilis grown in Pokic Bivoth. 



At I, the eluincnts are thickened. The preparation liad Vjeen dried and stained w ith 



aniline purple. 



peculiar to any one species, but can be noticed in all species ; 

 it is particularly conspicuous in those in which the young 

 elements are short, e.g. fowl cholera, fowl enteritis, septi- 

 cemia of rabbit, swine fever, &c., &c. But also amongst 

 the longer, i.e. cylindrical, elements the middle part of the 

 rod apiiears very often unstained and clear, while the proto- 

 plasm at the end is denser and stained ; the middle clear 

 part is at the same time more or less well marked off with 



