DISEASES 141 
from the disease, then eggs or chicks from 
that flock may be sold with the assurance 
that there is no white diarrhea present, and 
the purchaser should be able to grow the 
chicks without heavy mortality. In pur- 
chasing day-old chicks or hatching eggs 
every effort should be made to see that the 
eggs or chicks came from a flock which has 
been tested and found free from the disease. 
Colds. Colds are more or less common, 
especially in rather poorly constructed or 
poorly ventilated henhouses. While the 
effects of a simple cold are seldom fatal, yet 
whenever the birds contract a cold the egg 
production is almost certain to drop. If the 
vitality and resistance of the birds have 
been lessened by colds, they are much more 
likely to contract other diseases, especially 
diseases of the respiratory system such as 
roup. 
The symptoms of a cold are a sneezing, 
which can be heard especially after the birds 
have gone to roost at night, and a running 
at the nose. Usually some diarrhea is asso- 
ciated with it. The best cure, of course, is to 
remove the cause. If the house is improperly 
