CONTENT OF COW'S MILK 



15 



Sediment in Milk {Secondary reading). 

 {Parts per million hy volume.) 



Series 1. 20 samples of milk from 



20 separate cows . . 

 ,, 2. 20 samples of milk from 



purveyors' shops . 

 ,, 3. 20 samples of milk from 



dairy shops 

 ,, 4. 20 samples of milk from 



railway stations . 

 ,, 5. 20 samples of milk from 



well-known dealers . 



It cannot be doubted but that the vast proportion of the 

 matters which make up the sediment of milk gain access 

 at the cowshed. 



Orr^ examined 61 cowshed samples for sediment with 

 corresponding samples at the point where the milk was 

 supplied to the consumer. On considering the cowshed 

 samples and the records of the conditions present on in- 

 spection, it was found that the average amount of milk sedi- 

 ment from dirty cows was 52'5 volumes per million, the 

 lowest being 20 volumes and the highest 120 volumes, and 

 the average of milk from clean cows was 31'7 parts, the 

 lowest being 7"o and the highest 80 volumes per million. 

 The amount of sediment varied with the cleanliness of the 

 cows and the method of filtering. 



Comparing the cowshed samples, and the same at the time 

 of retailing, Orr found a decrease in the latter on the whole, 

 and concluded that the sediment gains entrance at the cowshed, 

 and little, if any, in transit. 



Delepine ^ estimated the volume of sediment from milk 

 supplied to Manchester over a number of years. Between the 

 years 1896-1900, he calculated the average amount of slime 

 arriving daily in 40,000 gallons of milk to be 106 lb. In 

 1906 the amount of slime in the same quantity of milk had 

 been reduced to 79 lb. He regards the amount of slime as 



1 Report on Milk OoiUamination, 1908. 

 - Heport of Medical Officer, Local Govermnent Board, 190S-9, p. 341. 



