LESSON VI 



Examination of Milk I. Quantitative Examination by Plate Culture 

 Method II. Qualitative Examination Bacillus of Typhoid Fever 

 Bacterium Coli Commune Streptococcus Pyogenes Bacillus 

 Diphtherise Tubercle Bacillus 



Examination of Milk 



I. QUANTITATIVE EXAMINATION. 



As ordinarily obtained, milk always contains micro- 

 organisms. 



(1) Collect the milk in sterile flasks, having first shaken 

 up the sample supplied. 



(2) With a sterile pipette inoculate several liquefied 

 gelatine tubes with quantities varying from '005 cc. to "05 

 or '1 cc. 



(3) Prepare gelatine plates, and place them in the cool 

 incubator. 



(4) Examine and count the colonies in the same manner 

 as was described on p. 95. 



As in the case of water, so here also, the quantitative 

 examination is of comparatively little use, the quali- 

 tative analysis being of much greater importance. 



