x.j BACILLUS. 77 



spores. For this reason even boiling of the fresh infusion for 

 a few minutes does not sterilise it. 



The bacillus grows well in every fluid that contains the 

 necessary salts and nitrogenous compounds ; thus all kinds of 



FIG. 41. GERMINATION OF SPORES INTO BACILU. 



a. Spores of a small kind. 



b. Spores of a larger kind of bacillus subtilis. 



Magnifying power about 700. 



broth, all kinds of animal fluids (hydrocele, blood-serum, 

 &c.), gelatine, peptone solution, &c., are suitable nourishing 

 media. 



The spores of the hay-bacillus are widely distributed in the 

 air, and most contaminations by air are due to its spores. 



FIG. 42. BACILLVS ULNA, IN THE CAPILLARIES OF THF. HUMAN LIVER. 

 POST-MORTEM CHANGE. 



1. Liver cells, somewhat swollen. 



2. Bacilli. 



Magnifying power 300. 



(ft) Bacillus vlna. By this name 1 Cohn designates certain 

 species of bacilli, stiffer and thicker than those of bacillus 



1 IMC. eit. p. 177. 



