GENERAL CHARACTERISTICS OF BACTERIA. 47 



characters, therefore, of the various organisms whenever 

 spores are mentioned, it will be understood that only 

 the endogenous spores are meant. 



FIG. 11. 



Unstained spores in slightly distended bacilli. (The spores are the light 

 spots in heavily stained bacilli.) 



FIG. 12. 



FIG. 13. 





Spores in distended ends 01 

 bacilli. 



Unstained spores in centre of bacilli 

 arranged in chains. 



The production of endospores in the different species 

 of bacteria, though not identical, is very similar. To 

 observe the formation of spores in any species it is best 

 to employ a streak culture on nutrient agar or a potato 

 culture, which should be kept at the temperature nearest 



