428 The Diseases of Animals 
the nervous system, which is shown by a peculiar vacant 
stare in the eyes and twitching or trembling of the 
voluntary muscles. The disease comes on gradually 
and seldom causes any loss, as it can be remedied by 
withholding the cotton-seed meal. In fattening cattle 
for the market on cotton-seed meal, it is seldom advis- 
able to full-feed them for more than one hundred days. 
The symptoms described may appear after the animals 
have been on full feed for seventy-five days. 
When swine are fed large quantities of cotton-seed 
meal there sometimes results a severe irritation of the 
bowels, which in some respects resembles hog cholera, 
and may cause death. There may also be indigestion 
and heart failure. Swine sometimes die from an excess 
of eotton-seed meal when following cattle in the feed 
yards. 
DIRTY HAY 
Hay that is grown on river-bottoms that are subject 
to overflow sometimes contains a large amount of sand 
and other dirt. When such hay is fed it may set up 
severe diarrhea, due to irritation of the bowels. The 
treatment is to remove the cause. Dirty or musty hay 
should not be fed to horses on account of the danger 
of digestion troubles, and its tendency to cause heaves. 
LEAD POISONING IN CATTLE 
Lead poisoning in cattle is rather common, and 
arises in most vases from licking paint from boards, 
drinking water from paint cans or kegs or from lead- 
