BACTERIA 271 



by cleanliness of the water shed, and by building proper filtration 

 plants, where a supply of pure artesian water is not available. 



410. Comparative review of the bacteria. The bacteria 

 resemble the fungi in that chlorophyll is absent. Because of 

 their method of multiplication by simple division, or cutting in 

 two of the cells, which is sometimes calledjission, they are called 

 fission fungi or Schizomycetes, and by some are classed with the 

 fungi. But this method of fission is like that of the blue-green 

 algae, which they also resemble in the variety of forms and asso- 

 ciation of cells, as well as in the simple condition of the proto- 

 plast, and the slimy covering of the cell walls. For these reasons 

 some consider them more closely related to the blue-green algae, 

 and place them in a class called Schizophycecz with two sub-classes, 

 the Cyanophyceae (blue-green algae) and the Schizomycetes 

 (Bacteria). Still others place them in a class (Schizomycetes) 

 distinct from either the fungi or blue-green algae. This seems to 

 be the better arrangement. 



