212 



ESSENTIALS OF BACTERIOLOGY 



Examination of Yeasts and Molds. Yeasts and molds are 

 best examined in the unstained condition. A small portion of 

 the colony rubbed up with a mixture of alcohol and a 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-Uue stain very well. 



Cladothrices and Streptothrices. The streptothrix and 

 cladothrix groups are classed with the higher bacteria, but 



Fig. 128. Cladothrix dichomata from well-water (one-twelfth oil-immersion. 

 Fuchsin stain) (author's specimen). 



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

 ered as representing the transition from the bacteria to the 

 lower fungi. 



Streptothrix or Cladothrix Actinomyces (Ray-fungus) . 

 Actinomycosis is a disease caused in man and cattle by this 

 organism, which is commonly found in grain, particularly 

 barley. It is probable that several varieties of the parasite can 

 produce the characteristic lesions. It has been discovered in 

 all countries and in various organs of the body, although its 

 place of election is about the lower jaw, where it tends to form 

 hard, ulcerating abscesses, affecting other organs secondarily. 



Form. In the granular masses of an abscess cylindric fila- 



