PLATE XXIM. 



SACCHAROMYGES ALBIOANS. THE BLASTOMYCES OR YEAST-CAUSING THRUSH. 



The drawing is made from a hanging drop of a broth culture which had been 

 incubated at 37* C. for 24 hours. 



There is shown on the left and upper part of the figure a series of simple oval cells ; 

 and below these, similar cells from which the formation of a second element is pro- 

 ceeding ; this appears as a minute bud growing out from one of the ends or side of the 

 parent cell. Where the cells lie in groups their opposed faces are flattened or facetted, 

 an extensive group resembling a mosaic. The process whereby a filamentous stage is 

 reached consists in the elongation of the cells, which continue to give rise to others 

 from apex and sides until a complex branching system results. The chief secondary 

 branches arise from the nodes of the main filaments, and from the former a tertiary 

 set of smaller cells, and so forth. 



On the right hand side are shown four cells, the protoplasm of which has been tinted 

 with a dilute aqueous solution of gentian violet ; they exhibit a certain number of 

 spaces filled with fluid, or vacuolea, analogous to those holding sap in higher plants ; 

 and spherical granules, the function of which is not yet known, possibly zymogenic 

 in nature. 



In the elongated or filamentous cells the vacuoles are sometimes of considerable 

 length, and can be readily seen in tbe unstained condition. 



