DIRECT EXAMINATION 



47 



:ounting spores and yeast cells a magnification of 180 diam. 

 ;vould prove very satisfactory, especially with a well -corrected 

 vide aperture objective. The counting of cocci is more confusing 

 han the counting of bacilli, but fortunately the microbic contami- 



FIG. ii. Cluster of mold hyphse in granular (decomposed) tomato pulp. This 

 type of mold is traceable to field-rotted tomatoes. The finding of hypha; of this 

 type in tomato catsup indicates the use of rotted tomatoes, therefore, indicates 

 inadequate culling at the factory. (Howard, Yearbook U. S. Dept. of Agriculture, 

 



nations of most vegetable substances are bacillar, though there are 

 some notable exceptions. 



Mold Counting. Thus far no satisfactory method for making 

 estimates of the amount of mold hyphae present in fruit and in 

 animal products has come into use. The method recommended 

 by B. J. Howard, Chief of the Micro-chemical Laboratory of the 

 U. S. Bureau of Chemistry, namely, determining the degree of 



