THE BIOLOO Y OF MICROBES^ ETC. 173 



Cohu and Warming in pond-water. It is said to be 

 morphologically identical with Spirillum volutans. 

 The cells contain numerous red bodies and many 

 sulphur granules. According to Saville Kent, 1 this 

 microbe is not identical with Ehrenberg's Ophido- 

 monas sanguinea : the latter being a true monad. 



Spirillum concentricum. This microbe was dis- 

 covered by Kitasato in putrefactive blood. It grows 

 rapidly on gelatine-plates, giving rise to greyish- 

 white round colonies, each of which has concentric 

 markings. It does not liquefy the gelatine, and is 

 non-pathogenic. 



Besides the above-mentioned spirilla, there are 

 the following, which occur in brackish and sea 

 water : S. violaceum, S. Rosenbergii, S. attenuatum, 

 etc. ; but the reader is referred to the works of 

 Warming for an account of these microbes. 



SPIROCILET.E. 



Spirocliceta plicatilis. This microbe is of extra- 

 ordinary length 110 to 225 p (Fig. 33, 19). It 

 occurs in stagnant water. The threads are arranged 

 in wavy lines. 



Spirochceta gigantea. The threads are blunt at 

 both ends. It occurs in sea-water. 



YEAST-FUNGI. 



These fungi are not microbes (i.e. they are not 

 Schizomycetes), but belong to an altogether different 

 order the Saccharomycetes. They multiply chiefly 



Manual of the Infusoria, p. 244. 



