264 THE BOOK OF BUTTER 



tested. (2) A prepared solution for cleaning the test- 

 bottles. This may be made as follows : Mix hot water, 

 "gold-dust" or other good glass cleaner, and lye to 

 destroy the casein formation quickly. This solution 

 may be used several weeks before it is discarded. The 

 container of the cleaning solution should be sufficiently 

 large to admit a test-bottle rack, and if possible means 

 should be provided to heat it. (3) Test-bottle racks that 

 are easily handled and sufficiently large to hold the same 

 number of bottles that the centrifuge will contain. (4) 

 Handy acid measures, such as the little glass dipper which 

 is especially convenient for measuring acid into cream 

 test-bottles because of their large necks, or the bottle 

 with the measure on the side that is filled by tipping the 

 bottle. This latter measure may be used easily in filling 

 milk or cream test-bottles. (5) A brass or a copper 

 collar for each composite sample bottle on which is placed 

 the patron's number. The metal should be fairly thin 

 and soldered around the neck of the bottle. This is easy 

 and simple, and a certain identification of the sample. 

 For daily cream samples small jars with aluminum tops 

 are convenient. The patron's number may be placed 

 easily on these tops and later the numbers may be readily 

 erased. (6) A brass or copper collar for each test-bottle 

 on which is stamped a number. This saves practically all 

 the time required to place the sample or patron's number 

 on each test-bottle. The test-record sheet should have a 

 column for the patrons' numbers and one for those of the 

 test-bottles. The time saved would be the difference 

 between that required to erase the old numbers on the test- 

 bottles and in placing the new numbers on them ; and in 

 simply writing the numbers of the bottles opposite those 

 of the samples on the record sheets. 



