186 ESSENTIALS OF VETERINARY LAW 
state and foreign commerce. It has no authority 
in purely internal affairs in the individual states. 
The state official has full authority, provided the 
state has enacted laws which grant him the 
authority. 
The rules of the Bureau of Animal Industry of 
the Department of Agriculture, organized by Act 
of Congress, May 29, 1884,!° known as the ‘‘ Ani- 
mal Industry Act,’’ for the suppression of con- 
tagious disease among domestic animals, have not, 
apart from the action of a state, any binding force 
upon the state..7_ In the case of a contagious dis- 
ease in the Chicago Stockyards the Chicago au- 
thorities, and the Illinois authorities might enforce 
a local quarantine. The national representative 
could not do this, but in case he considered the 
act necessary he might quarantine the whole state 
of Illinois. In ease that a Chicago inspector found 
that infected dairy products were being shipped 
from farms in Wisconsin to Chicago, he would 
have no legal authority to stop those products 
until they reached the city limits. The state rep- 
resentative could stop them at the state line. 
Neither could exert authority within Wisconsin. 
On the other hand, before the goods left the farm, 
when they were marked for shipment to Chicago 
destinations, the national official could step in 
and seize the goods, for interstate commerce be- 
gins as soon as the goods are prepared for ship- 
ment.8 
16 C, 60, 23 St. 31. 18 PUBLIC HEALTH, 238. 
17 Eshleman vy. Union Stock- 
yards Co., 222 Pa. 20, 70 Atl. 
899. 
