252 



CLEAN MILK 



as containers * is recommended as superior to one designed for 

 bottles (Fig. 62). 



It has been proven that with samples kept properly iced 

 in this particular form of case there is no increase of bacterial con- 

 tent even after twenty-four hours, but rather a slight decrease, the 

 counts varying hardly more than might be expected in duplicate 

 plates. It is recommended, however, that examination of the sam- 

 ples be proceeded with as quickly as possible after the collections 



are made. 



Fig. 62. 



5A 



Boston Board of Health — collecting case for milk samples. (After Conn. ) 



The samples are removed from the cans with sterilized pipettes, and placed in 

 tubes. These are placed in weighted racks (A) and put into the center compart- 

 ment of the carrying case. 



Identification of Samples. — When bottles are used identifica- 

 tion numbers should be etched on both bottle and stopper. Test 

 tubes should be labeled or etched and numbered. 



A complete record of the samples taken, giving date, time, 

 place, name of party from which sample is taken, name of collector, 

 temperature of milk, character of original container (tank, can. 



* Am. Jour. Pub. Hyg. , Nov. '04. 



