Physiology of 3Iicrobes. 37 



VII. Classification. 



Cohn has proposed to class the bacteria among the 

 lower algffi. Previously they were generally con- 

 sidered as fungi. Several classifications of microbes 

 have been proposed, none of which are perfect; we 

 reproduce that of M. Guignard. The grouping of 

 bacteria, however, has but little importance from our 

 point of view. JS'evertheless, it will assist the reader 

 to a correct understanding of the meaning ascribed to 

 certain terms in common use. 



