146 PRINCIPLES AND PRACTICE OF MILK HYGIENE 
central feed alley, feeding is facilitated and, if there are 
windows in the side walls, the posterior part of the cow 
is in the lightest part of the stable, which is a convenience 
in cleaning the cow and in milking; but the spread of 
infection is favored because material coughed out by one 
cow may be deposited in the feed trough of the cow 
standing opposite in the other row. With the cows fac- 
ing outward toward the side walls, the cleansing of the 
stable and the removal of the manure is facilitated and 
there is less exposure to infection by coughing, but the 
cleaning of the cow and the milking must be done in 
the darkest part of the stable and the milk must also be 
carried between the two rows of cows and is thus exposed 
to external contamination, especially in the fly season 
when the cows frequently switch their tails. 
Maternity and hospital stalls should be provided in 
another part of the building or in another building. If 
there are not special stalls for these purposes, cows with 
vaginal discharge from retained placenta and with other 
pathological excretions will be stabled in the milking line 
and may infect the milk indirectly. 
(d) Light.——The cow stable should receive sufficient 
daylight to make it possible to read ordinary newspaper 
print in the middle of it. This much light is necessary for 
the cleaning and the milking of the cows to receive proper 
attention. Nearly all of the work which must be done in 
a cow stable can be done better and easier in the light than 
in the dark. The admission of sunlight into a stable is 
beneficial in several respects. It lights the stable and 
exposes dirt, thus assisting in keeping the stable and 
cows clean; it facilitates careful milking; assists in dry- 
ing out the stable; supplies some warmth to the stable in 
winter, and has a disinfectant action. The germicidal 
