26 MILK AND ITS HYGIENIC RELATIONS 



H. Notes on the Chemical Composition of Milk as Affected by possible 

 Disease of the Gland. The work of several of the investigators 

 already quoted has shown that a deficiency of nutriment or other 

 unsatisfactory condition of health may lead to a diminution either in 

 the total milk supply or, under certain circumstances, to the decrease 

 in certain constituents of the milk, usually, however, the former. 



The work of several observers who were considering the possible 



Diagram showing the Amount of Milk and the Fat-content of each Feed on 

 eight consecutive days. (After Helbich.} 1 



700 



The shaded part represents the amount of milk given, and the dotted 

 line the percentage of fat, on each occasion. The intervals were four-hourly 

 during the day, with an eight-hour one at night 1 . 



disease of one or more quarters of the udder, shows that circum- 

 stances may arise in which the milk from one quarter may show a 

 marked decrease in the amount of lactose accompanied by an increase 

 in the nitrogen, and possibly alterations in the other constituents. 



Thus Hewlett, Revis, and Villar in 1910, in the course of investi- 

 gations carried out upon the cellular content of milk, showed that 

 in a number of cases where a high cell-content was obtained, there 

 was an abnormally low content of lactose. This was sometimes 

 accompanied by an increase in the total protein present. In 



1 Sm p. 35. 



