YEASTS AND MOLDS 227 



few drops of liquor ammonia ; of this, a little is brought upon 

 the glass slide, covered with a drop of glycerin, and the cover- 

 glass pressed upon it. If the preparation is to be saved, the 

 cover-glass is secured by ringing around the edges with 

 varnish or cement. Yeasts take methylene-blue stain very 

 well. 



Cladothrices and Streptothrices. The streptothrix and 

 cladothrix groups are classed with the higher bacteria, but 

 their exact status is still undetermined. They may be con- 



I 



I s 



/// ' / r , ' f / 



* / 



r- * 







. * \ \ 



I Y \ 



Fig. 112. Cladothrix dichomata from well-water (one-twelfth oil-im- 

 mersion. Fuchsin stain) (author's specimen). 



side red as representing transition forms from the bacteria to 

 the lower fungi. 



Crenothrix Kiihniana (Rabenhorst) . Long filaments 

 joined at one end; little rod-like bodies form in the filaments, 

 and these break up into spores. 



Zooglea are also formed by means of spores, and these can 

 become so thick as to plug up pipes and carriers of water. 

 They are not injurious to health. 



Cladothrix Dichotoma (Cohn). Very common in dirty 

 waters. The filaments branch out at acute angles, otherwise 

 resembling the crenothrix; accumulations of ocher-colored 



