308 



GENERAL SCIENCE 



beef, and pork. The high temperature of the cooking 

 process kills these larvae, and at the same time destroys 

 any other living germs. 



The milk supply is a much more serious problem so far as 

 purity is concerned. It is one of the chief foodstuffs of 

 people, especially for infants and small children, and it may 

 easily become a menace to health. The dairyman is indeed 

 a neighbor to us all in his care, or carelessness, as these affect 



FIG. 98. Pasteurizing milk. Heating and cooling done by circulation first of 

 hot and then of cold water. 



our health. Since it is almost inevitable that town dwellers 

 are dependent upon the milkman for their daily supply, 

 city authorities acting as Boards of Health exercise close 

 supervision over the conditions under which milk is sold in a 

 city. The use of stoppered bottles for milk should always 

 be insisted upon. But this is no sufficient guarantee that 

 the bottles may not have been carelessly sterilized, or washed 

 in water containing disease germs. The germs of typhoid, 



