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 



