74 POULTRY FOR PROFIT 
common poultry diseases. These three diseases 
are all supposed to he due to a small organism 
which multiply very rapidly, and acts mostly 
on the skin of the bird. These diseases are not 
similar in appearance, however, despite the fact 
that their source is the same. 
Roup attacks the mucous membrane lining 
of the nose, and eye. Th#se parts become red 
and inflamed, and infected with a pus forma¬ 
tion. This disease is spread largely through 
the drinking water, and is prevalent in the 
spring when it is damp. Keep the birds healthy 
and vigorous, provide proper ventilation, and 
have things as dry as possible, and little should 
be feared from this source. 
Chicken pox makes its appearance on the 
comb and wattles, and also on the face of the 
bird, by small pockets on these parts. The 
remedy is the same in this case as has been 
stated for roup, except that if only a few birds 
have contracted the disease, each bird can be 
taken in hand and given individual treatment, 
by removing the crust over the sores, and apply¬ 
ing a good disinfectant. 
Canker manifests itself by pale yellow spots 
on the inside of the mouth. This is best 
