MOULDS AND YEASTS. 165 
Il. MOULDS AND YEASTS. 
Moulds and yeasts frequently contaminate plate 
and tube cultures, and inasmuch as these growths 
are occasionally the cause of pathologic conditions, 
Fic. 94.—Saccharomyces cerevisiz. 
it is advisable that the bacteriologist be acquainted 
with certain typical forms. 
Fic. 95.—Mucor racemosus: a, spore-bearing head; 8, 
spores; ¢, branch; d, resting spores (after Jelliffe). 
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