CHAPTER VI. 
COMPOSITE SAMPLING. 
Where milk is bought on the fat basis, it is essential 
that it be sampled daily as it arrives at the creamery. It 
is not practicable, however, to make daily tests of the 
samples because this would involve too much work. Each 
patron is therefore provided with a pint jar to which 
samples of his milk are added daily for one or two 
weeks, the sample thus secured being called a composite 
sample. A test of this composite sample represents the 
average percentage of butter fat in the milk for the period 
during which the sample was gathered. 
Careful experiments have shown that quite as accurate 
results can be obtained with the composite method of 
testing as is possible by daily tests, besides saving a great 
deal of work. This has lead to its universal adoption 
wherever milk is bought by the Babcock test. 
All composite jars should be carefully labeled by plac- 
ing numbers upon them. These numbers should be writ- 
ten in large indelible figures as exhibited by the composite 
jar shown in Fig. 24. Shelves are provided in the intake 
upon which the jars are arranged in regular consecutive 
order. Numbers corresponding to those on the jars are 
placed on the milk sheet opposite the names of the patrons 
which should be arranged alphabetically. 
Taking the Samples. Whatever the method of sam- 
pling, all milk should be sampled immediately after it 
enters the weigh can, not, as is frequently the case, after 
it is weighed. 
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