SANITARY AND UNSANITARY BARNS 37 
hide and from barn air into milking pails 
causes serious contamination of milk with dirt 
and bacteria. 
Well constructed and sanitary barns are de- 
sirable because they reduce stable dust. Cement 
floors, iron stanchions, smooth and tight ceil- 
ings and walls, abundant windows, ventilating 
and drainage system, feed carriers, manure car- 
riers, beds of cork brick, all these things are aids 
to sanitation, but are more expensive than most 
farmers can afford. The beautiful barns pro- 
ducing certified milk are some of them cow 
palaces, but after all the only thing such barns 
can accomplish is to reduce the quantity of 
stable dust. 
Stable dust can be reduced in any barn by 
any farmer by extra care. Even the commonest 
barn with a dirt floor and rough walls can be 
kept free from excessive dust by the farmer who 
knows how. 
But stable dust is of very small importance 
compared with other sources of contamination 
of milk. The barn itself is of small importance, 
and stable dust is of small importance compared 
with the damage to milk by direct droppings from 
the cow’s hide into the milking pail, or damages 
