CLARIFICATION OF MILK. 



189 



of dirt were present in the bottom of the tubes. From this one gathers 

 that the clarifier still removes dirt after the milk has been passed through 

 the cotton disc of the Wisconsin Cotton Disc or Sediment Tester. 



In another instance this trial was made with 2 pints of commercial 

 milk. Dirt was recognized after submitting the milk to the same pro- 

 cedures as above. Evidences of dirt appeared on the clarifier bowl also. 



A little different form of experimentation was then adopted to demon- 

 strate the efficiency of the clarifier in removing insoluble dirt. Definite 

 quantities of milk were run through the clarifier; a sample of clarified 

 milk was taken from time to time, centrifuged and examined for dirt. 

 Table XIX gives the results of this experiment. 



Table XIX. — Efficiency of Clarifier in Eliminating Dirt. 



[All samples of milk showed presence of dirt before clarification. Claimed maximum efficiency 



Sawdust was present. 



