140 BACTERIA 



detected. The whole of the protoplasm stains strongly 

 with the ordinary nuclear stains, and it is likely that 

 what corresponds with the chromatin of the ordinary 



f 



/ 



B 



c V 



,-\/v 



y^ 



F 



f-r-/ 



FIG. 15. Various forms of Bacteria. X 1,000. A, Staphylococci 

 (groups) and Streptococci (curved chains) from pus (the large 

 spherical body is a pus corpuscle). B, Nitrosomonas, a nitrifying 

 bacterium from soil, with single flagellum. C, Bacillus typhosus 

 (typhoid), showing flagella. D. Bacillus anthracis (anthrax), 

 showing spores (one in the centre of each cell). E, Bacillus 

 tetani (tetanus) . Note . the spherical spore at one end of and 

 much broader than the cell. F, Cholera spirillum, with a flagellum 

 at each end of the cell. G, Spirochate pallida (syphilis spirillum). 

 After Muir and Ritchie. 



cell nucleus exists in the bacterial cell equally distri- 

 buted through the cytoplasm. The protoplasm is 

 surrounded by a membrane of gel structure (as is always 



