102 BUTTER-MAKING. 
corrosive sublimate tablet will keep a half-pint to a pint of 
milk or cream in good condition for about two weeks in summer, 
and about three weeks in winter, providing the sample is properly 
cared for. Some makers are practicing testing at the end of 
every month during the winter, and every two weeks during 
the summer. Testing at the end of every month saves labor, 
but it is not a reliable method to follow under all conditions, 
as some of the samples are likely to be somewhat impaired 
after standing so long. 
Arrangement of Composite Samples.—Pint glass jars with 
covers are, so far as known, the most convenient vessels to 
use for composite samples. Shelves should be arranged in the 
weighing-room on which to keep the bottles. If possible, it 
is best to have them in a case closed with glass sliding doors. 
This is neat, and, if the glass doors fit well, the samples are in 
some measure protected in case of quick, unexpected changes 
in temperature. These sliding doors should be locked when 
the creamery operator is absent from the creamery, in order 
to prevent any tampering with the composite samples. 
The best method of arranging the sample jars is to have all 
the jars belonging to the patrons of each route standing in 
one group, or on one shelf together, if possible. The bottles 
are numbered to correspond with the number given each patron 
on the milk sheet. The name of the hauler, or the number 
of the route, can be put on each shelf. The samples be- 
longing to those who haul their own milk can be put on another 
shelf. These can be designated as individual haulers. Such a 
classification, when the bottles are plainly numbered, will often 
prevent the mistakes that are likely to occur if the bottles are 
simply numbered and put into a rack together. 
Care of Composite Samples.—In the first place the jars should 
be kept scrupulously clean. It makes the test unreliable if 
the jars are left covered with milk and molds round the neck 
from one month to another. When the samples have been 
tested the jars should be thoroughly cleaned, and, if necessary, 
scalded, before they are used again. Care should be taken to 
