126 



PRACTICAL DAIRiT BACTERIOLOGY 



DIAGRAM SHOWING THE EFFECT UPON THE BACTERIA OF MILK OF 

 WIPING THE UDDER WITH- A DAMP CLOTH 



Not wiped, 



Wiped, 



Decrease due 



to wiping, 



Some dairies have the practice of brushing the cow just be- 

 fore milking. This by no means serves the purpose of wiping 

 with a damp cloth. On the contrary it simply stirs up the dirt 

 and dust and leaves it floating in the air in a position to settle 

 readily into the pail. The result is that there is an actual in- 

 crease of bacteria rather than a decrease. The amount of 

 increase, as shown by one series of tests, is indicated in the ac- 

 companying diagram. 



DIAGRAM SHOWING THE EFFECT OF DRY BRUSHING OF THE UDDER 

 BEFORE WIPING 



Not brushed, 



Brushed, 



Increase due 



to brushing, 



The Covered Pail. In very recent years changes have been 

 made in the methods of milking, designed for reducing the 

 amount .of dirt which falls into the milk during the milking 

 process. The first and simplest of these is the change in the 



