_. DISEASES OF THE HOG. 153 
apply the oxide of zinc ointment, made by mixing 
one ounce of the oxide of zinc with two ounces of 
vaseline. This can be used once or twice a day, 
according to the severity of the case. . 
SCALY DISEASES OF THE SKIN. 
There are a number which are usually classed 
together as it would be impossible to distinguish 
one from the other in the pig, namely psoriasis, 
_ lepra, pityriasis, ete. 
‘Causes: Heat of the sun in summer and cold in 
winter. This condition of temperature has a won- 
derful effect on the skin of some hogs. There are 
other causes which are obscure. The disease is 
not contagious. < 
Symptoms: The disease first begins by the for- 
mation of minute pimples too small to be seen on 
the skin of the pig; these pimples dry up and the 
scarf skin peels off in flakes; this is usually re- 
peated several times and may pass away. At oth- 
ers the skin is inflamed, thickened, and intersected 
in all directions with furrows which are often deep 
and filled with a white powdery matter; the hair 
-comes off and will not grow until the skin becomes 
healthy. Pigs affected with this scaly disease pre- 
sent a very ugly appearance, and it is the most 
common form of skin disease among hogs. In 
some few cases the skin will crack, causing much 
pain to the animal when it moves, especially if it 
be in the region of the joints. 
Treatment: If the pig is fat give it from one to 
two ounces of sulphate of magnesia dissolved in 
