78 ATLAS OF BACTERIOLOGY. 



discovered and studied by him (but unfortunately not 

 in pure cultures) . In these the process ran the fol- 

 lowing course : Without any cessation in the motion 

 of the bacillus, one extremity becomes somewhat en- 

 larged and acquires a slightly greenish tinge. The 



9 



\ 



rf 



FIG. 9. Types of Spores. 



entire contents of the distended part now contract 

 into a spore of bluish-green color and striking bril- 

 liance. 



In the most important varieties the mature spores 

 appear as follows (Fig. 9) : 



1. The spore lies in the interior of a non-dis- 

 tended, short bacterium cell (a). 



2. The spore lies in the interior of a non-distended, 

 short bacterium cell, which forms merely a link of a 

 long filament (6). 



3. The spore lies in the interior of a bacterium cell, 

 which has been distended in the middle and has be- 

 come spindle shaped (d). 



4. The spore lies at the extremity of a non-distended 

 short bacterium cell, apparently projecting far beyond 

 it (c). 



The germination of spores has been little studied. 

 They are generally set free before germination by rup- 

 ture of the filament. An outgrowth of the spores in 



