104 PRINCIPLES AND PRACTICE OF MILK HYGIENE 
udder or with open, discharging actinomycotic tumors. 
Milk from cows in the latter condition is further objec- 
tionable because it may contain pus and pyogenic or- 
ganisms, and, in advanced cases, for the additional reason 
that the general condition is affected, the animal becom- 
ing emaciated, weak and dull. 
MILK SICKNESS OR TREMBLES 
Cattle and horses when pastured on certain lands in 
circumscribed areas in the United States develop a dis- 
ease known as milk sickness or trembles. Its etiology 
has been the subject of much speculation and investiga- 
tion. In 1907 Jordan and Harris isolated in pure culture 
from the blood and organs of animals dead of the disease 
a spore-forming bacillus with which they succeeded in 
reproducing the disease in experimental animals. They 
have given this organism the name of Bacillus lactimorbi. 
The principal symptoms of the disease are violent trem- ° 
bling and great restlessness, followed by paralysis. The 
animal may fall and die suddenly, but usually it lies sev- 
eral days in a paralyzed condition. The disease is trans- 
mitted to man through the milk, butter, and meat from 
affected animals. The symptoms in man are severe 
vomiting, difficult breathing, subnormal temperature, 
paralysis, and death. 
II. Diseases or CaTrLe WHICH MAY RENDER MILK 
HarmMFvt To Man. 
INFLAMMATION OF THE UDDER—MASTITIS 
Cows are very frequently affected with mastitis, a 
disease of great economic as well as hygienic importance. 
There are three forms of the disease: (1) Catarrhal mas- 
titis, which may be either mucous or purulent, and which 
