MILK III 



I. Ordinary mixed milk samples for general bacterial con- 

 tamination. 



Make dilutions A, B, C, D as above. 



(a) Examine the stained centrifugalised deposit from loc.c. 

 If streptococci are very numerous enumerate them using a series 

 of neutral red broth preparations. 



(b) Estimate the number of B. coli and allied organisms. 



(c) B. enteritidis sporogenes spores. 



II. Samples to be specially examined for the tubercle bacillus. 

 Examine both microscopically and by animal inoculation. 



III. Special examination of the milk of individual cows. 



(a) Carefully examine the stained centrifugalised deposit, 

 including a differential cellular count. 



(b) Estimate the number of B. coli and allied organisms. 



(c) Estimate the cellular content. 



(d) Examine for and estimate the number of streptococci. 

 Brush definite fractions over plates of suitable solid media and 

 isolate the chief varieties present. 



(e) If necessary examine specially for B. tuberculosis. 



CHAPTER VII 



MODIFIED MILK AND MILK PRODUCTS 



I. Condensed Milk. 



Condensed milk is prepared by concentrating either whole 

 or separated milk, with or without the addition of sugar. 

 Theoretically, therefore, there are four kinds of condensed milk, 

 but the writer is not aware of any unsweetened separated 

 brands. The four kinds are : 



(a) Sweetened condensed whole milk. 



(b) Unsweetened condensed whole milk. 



