234 



MASS. EXPERIMENT STATION BULLETIN 187. 



Table XL VIII. — Effect of Clarification on Pure Cultures of Molds and 



Yeasts. 



Ehizopus nigricans spores. 



Penicillium glaucum spores. 



Oidiuni lactis spores. * 



Saccha'romyces cerevisicB. 



Aspergillus niger spores. 



Note. — Molds were grown in pure culture; spores were swept up with sterile filter paper and 

 introduced into 1,000 cubic centimeters of sterile milk. After thorough agitation mUk was clari- 

 fied under sterile conditions. Counts were made immediately before and after. 



Cultures of Saccharomyces cerevisice were grown on wort medium at room temperature for three 

 days; 5 cubic centimeters of the culture were inoculated directly into 1,000 cubic centimeters of 

 SterUe milk. After thorough agitation, milk was clarified under sterile conditions. Counts were 

 made immediately before and after. 



1 "Sterile" means that no colonies appeared when plates were made of the dUutions indicated. 

 « Oidium was grown directly in sterUe milk at room temperature for three days, untU small 

 colonies appeared on surface. 



