134 



CLEAN MILK 



once a week. If the milk is sold as " certified," it must receive 

 the sanction of some medical milk commission or Board of 

 Health. The bacterial content or number of germs should not ex- 

 ceed 30,000. 10,000 germs is the maximum number permitted by 

 many milk commissions (see p. 25) to the cubic centimeter, and this 



Fig- 37- 



Banjo Conductor for carrying milk through a wall. 



is the proper standard according to the consensus of authorities at 

 the present time, in so-called certified milk. It is perfectly possible 

 to produce milk which shall not exceed in number 2,000 to 4,000 

 germs to the cubic centimeter by the comparatively simple and inex- 

 pensive plant which has just been described above, as the author 

 has practically demonstrated. 



Fig- 38. 



Cylinder for conveying milk through a floor. 



A more perfect arrangement in a dairy building for handling- 

 clean milk is of advantage when one can afford it. The most im- 

 portant improvement consists in separating the bottling or milk 

 room proper from the wash room, in which the sterilization and 

 washing of the milk utensils are done, and to devote two rooms to 

 these different processes. ( 1 ) The boiler and engine should have a. 



