COVERED PAIL TO EXCLUDE FILTH FROM MILK. 12 1 



In the fresh milk from the covered pail the total number of bac- 

 teria was about yi per cent. , and the number of acid bacteria about 

 S9pcr cent, of those in the fresh milk from the open pail. In the 

 fresh strained fnilk the total mimber of bacteria was 8p per cent, 

 and the number of acid bacteria 8j per cent, of those in the milk 

 not strained. 



After the milk had stood for fifty hours at constant temperature 

 of jo° F. the average for the total number of bacteria was larger 

 in the milk from the covered pail than in that from the open pail- 

 while the average for the acid producing species was larger in the 

 latter than in the former. In the strained milk both the total 

 number and the number of acid bacteria were larger thaji in the 

 viilk not strai7ied. 



The 7)iilk from the covered pail curdled sooner than that from 

 the open pail, the average difference being about seven hours; like- 

 wise the strained viilk curdled sooner than the milk not strained^ 

 the average difference being also about seven hours. This fact, 

 however, is of but little moment since any of these samples had 

 they been kept at the usiial temperatures for handliyig milk would 

 have remained sweet longer tha7i milk is usually kept. 



The results of these tests would seem to indicate that the covered 

 pail is more efficie^it for the productio7i of pure 77iilk tha7i st7-ai7i- 

 i7ig milk draw7i i7ito an open pail. It is quite evide7it also that to 

 keep the dirt out of the m.ilk i7i the first place is 7muh better than 

 strai7ii7tg it out after the i7iilking. A co7isiderable portio7i of the 

 dirt dissolves quickly i7i the warm 77iilk a7id thus i7itroduces a co7i- 

 tami7iatio7i that cannot be strai7ied out. 



It has already bee7i pointed out that these tests were 77iade i7i a 

 dairy tvhe7'e the co7iditio7is of clea7ili?iess are good. The a77iou7it 

 of filth such as dirt, hair, etc., that is f'equeyitly re7)wved by a 

 separator fro77i 77iilk of ordinary dairies as delivered in cities is 

 f}'eque7itly appalli7ig . It would be interesting to test the efficie7icy 

 of the covered 7nilk pail i7i dairies whe7'e the sa7iitary co7tditio7is 

 are 7iot so good as they zvere i7i these tests. 



