PATHOGENIC YEASTS. 157 



cerevisiae or beer yeast. This variety has been found in the 

 coating of the tongue, in vomited matter, in diarrhceal stools, 

 in the vagina, and in diabetic urine. There are said to be 

 several varieties of the cerevisise, each of which gives the 

 malt product a characteristic taste. Brewers cultivate the 



FIG. 66. 



Saccharomyc.es albicans. (Grawitz.) 



yeasts with this end in view, and the different kinds of beer 

 are produced in this way. 



The yeast which forms the mouldy growth on wine-pre- 

 serves, and sour kraut is the Mycoderma vini or Saccharomyces 

 mycoderma. Several of the yeasts produce pigments. 



Prominent among the PATHOGENIC YEASTS are Saccharo- 

 myces hominis, which was found in a case of pyaemia ; and 

 Saccharomyces subcutaneus tumefaciens, found in a large myxo- 

 matous tumor of the thigh. 



Yeasts have been observed in the blood, sputum, and urine 



