CLARIFICATION OF MILK. 



229 



Incidentally only, it is interesting to note the effect of repeated clari- 

 fication upon the same sample. From this it may be seen that neither 

 the slime nor bacteria are removed to such an extent that repeated clari- 

 fication will not eliminate more bacteria and more slime. 



Table XLVI. — Effect of Repeated Clarification on Bacterial Count of 

 Same Sample of Market Milk. 



In connection with the singlfe and serial bacterial counts it will be 

 pertinent to study also the effect of clarification upon specific organisms 

 in different substances, for in this manner a possibility is furnished of 

 gaining some adequate notion of how the clarifier acts in centrifuging out 

 certain types of organisms. 



Table XLVII. — Effect of Clarification on Pure Cultures of Bacteria. 



B. suhtilis. 



Suspended in • 



Before 

 Clarification. 



After 

 Clarification. 



Result 



or Per Cent. 



Removed. 



First Test. 



Water 



Broth (A. P. H. A.), . . 

 Skimmed milk, . 



Second Test. 



Water, 



Broth (A. P. H. A.), . 

 Skimmed milk, . 

 Whole milk, 



105,000 

 95,000 

 107,000 



75,000 

 90,000 

 95,000 

 92,000 



7,000 

 15,000 

 48,000 



2,000 

 18,000 

 25,000 

 56,000 



93.3 

 84.3 

 55.2 



97.0 

 80.0 

 74.0 

 40.0 



