TANKS OF STILL WATER 69 



water. Farm springs may have temperatures in 

 the summer time from 50 to 60. Where water 

 runs by gravity or through the operation of a 

 pump, the temperature of the milk in such tanks 

 can be kept as low as the lowest temperature of 

 the water, and milk can be cooled without stirring. 



TANKS OF STILL WATER 



Where dairies have no running water and no 

 ice, and must depend upon tanks which have been 

 filled from a pump or a well, the best results can be 

 secured by stirring the milk. Such stirring will 

 bring milk to the temperature of the water in 

 about half the time required to reach such a tem- 

 perature if unstirred. Under these conditions, the 

 stirring of night's milk is particularly necessary 

 in summer time. Stirring rods should be of smooth 

 metal and not of wood. 



MORNING'S MILK AND NIGHT'S MILK 



When the dairyman delivers milk for shipment 

 once a day, and the time selected is the morning, 

 morning's milk is twelve hours newer than night's 

 milk. The cooling of night's milk is then far 

 more important than the cooling of morning's 



