148 ESSENTIALS OF VETERINARY LAW 
posed upon the carrier which brings the persons 
or animals into the state, as being incident to the 
business in which it is engaged.*! The authority 
of the individual states to enact such laws is be- 
yond question, even where their operation inter- 
feres with interstate or foreign commerce, but 
this authority cannot be made to cover discrimina- 
tions and arbitrary enactments.* 
Primarily the authority of quarantine, being 
derived from police power, resides in the state; 
and cities, villages, towns, counties or other dis- 
tricts have only such power as has been given to 
them by the state in which they are located. Thus, 
under the power given by the state a county in 
Kentucky might establish and maintain quaran- 
tine against other parts of the same state, but it 
could not establish a quarantine against another 
state, nor against any part thereof, unless that 
power be distinetly given by the act of the state 
legislature.4? ‘‘Cities are no longer enclosed by 
stone walls and separate and apart from the bal- 
ance of the state. The sanitary condition exist- 
ing in any one city of the state is of vast impor- 
tance to all the people of the state, for if one city 
is permitted to maintain insanitary conditions that 
will breed contagious and infections diseases, its 
business and social relation with all other parts 
of the state will necessarily expose other citizens 
41 Minn., St. Paul & S. 8. M. 
Ry. Co. v. Milner, 57 Fed. 276. 
42 Simpson vy. Shepard, (U. 
8.) 33 Sup. Ct. 729; Hannibal, 
etc., R. Co. v. Husen, 5 Otto, 
465; Hurst v. Warner, 102 
Mich. 238; Salzenstein v. Ma- 
vis, 91 Ill. 391; C. & A. R. R. 
Co. v. Erickson, 91 Ill. 613; 
Jarvis v. Riggin, 94 Ill. 164. 
43 Allison v. Cash, 143 Ky. 
679, 137 S. W. 245. 
