188 ESSENTIALS OF VETERINARY LAW 



from infectious disease, or quarantined under the 

 supervision of an inspector of the bureau; but 

 horses driven or ridden in for a period of not more 

 than three days, or when returning after an ab- 

 sence in Canada of not more than three days, are 

 not subject to such restrictions. Horses belonging 

 to Indian tribes, settlers and immigrants, or in 

 connection with stock raising or mining, and those 

 intended for temporary stay not to exceed two 

 weeks, may be admitted without inspection upon 

 written permission of the Secretary of Agricul- 

 ture ; otherwise they must be inspected at point of 

 entry. 



The importation of tick infested horses from 

 Mexico is generally prohibited until after satis- 

 factory treatment. All ruminants, swine or horses 

 imported from Mexico must be free from infectious 

 disease, but tick infested cattle may be shipped for 

 immediate slaughter to points in Texas. Unless 

 accompanied by satisfactoiy evidence of freedom 

 from exposure to infectious disease the animals 

 will be quarantined. 



142. Federal Supervision at Slaughterhouses. 

 The federal control over interstate and foreign 

 transportation of animals is exclusive, and inci- 

 dentally this practically includes intrastate move- 

 ments as well. In supervision of the slaughtering 

 industry the federal supervision is distinct from 

 that which should be used over the intrastate in- 

 dustry. Here also the supervision is "under the 

 care of the Bureau of Animal Industiy; but in 

 many states the local business is practically free 

 from supervision, and animals condemned by 

 bureau inspectors may sometimes, and those which 



