138 



MILK 



of the handles. The milk or cream fills the sampler through the 

 slots and every layer of the can is then represented. After fill- 

 ing, the sampler is closed and removed. If cream is thick the 

 sampler should be dipped into hot water. Cream samplers have 

 larger slots than milk samplers (Fig. 30). 



A sampling pipet designed especially for taking composite 

 samples is described by Decker (Fig. 31). This pipet is a simple 

 glass tube \ inch in diameter and about 12 inches long. The 



Fig. 30. McKay sampler. 



Fig. 31. Composite milk sample pipet 

 (Decker). 



ends are drawn in abruptly, so that holes remain at the top and 

 bottom. The hole at the bottom is large enough to admit and 

 expel milk rapidly, while the hole at the top can be closed by the 

 finger. The tube is graduated so that as many units of milk can 

 be taken as there are pounds of milk in the pail. This pipet is 

 used chiefly for composite samples taken in milking pails. 



Other sampling devices are shown in Figs. 32-34. 



When milk from a single cow is to be sampled the whole 

 amount of milk should be drawn and mixed before a sample is 



