Composite Samples of Miik. 



175 



ered at the creamery, a sample of each was taketn with a Scovell 

 sampling tube. The tests of these four samples are given below, 

 together with the results of the individual tests: 



Sample taken at the farm, with dip- 

 per 



Sample taken at creamery with Sco- 

 vell tube 



Calculated from weights and tests of 

 raiJk from each cow 



Morning Milk 



4.4 per cent. 



4.5 " 

 4.5 " 



Niffht Milk 



3.8 per cent. 



3.7 " 



3.8 " 



The figures given show that practically uniform tests were ob- 

 tained by the different methods of sampling. 



Questions. 



1. What is a composite sample of milkl 



2. Describe the proper care of composite samples. 



3. Give an example showing that composite samples of milk 

 may be inaccurate when taken with a small dipper. 



4. Describe the construction of the following methods of sam- 

 pling milk or cream, by (a) drip sample, (b) the Scovell, (c) 

 the McKay, and (d) the Michels' sampling tubes. 



5. What is the purpose of adding preservatives to milk or 

 cream samples? Mention the more common preservatives used 

 and quantities to be adc"'!- 



