184 ESSENTIALS OF VETERINARY LAW 



quarantined for tuberculosis, except for immedi- 

 ate slaughter, unless found free from the disease 

 by the tuberculin test, and accompanied by their 

 tuberculin test chart. Cattle originating in prem- 

 ises which have been cleaned of tuberculosis under 

 the supervision of an inspector of the bureau, or 

 a cooperating state inspector may be moved inter- 

 state for any purpose (subject to a re-examina- 

 tion should the premises later show infection). 

 Cattle within the quarantined area, not visibly 

 diseased or known to be so affected, and which 

 are intended for feeding or grazing purposes, may, 

 on permit issued by an inspector of the bureau, be 

 shipped interstate, subject to such restrictions as 

 may be imposed by the state of destination. Cattle 

 from areas quarantined for tuberculosis which are 

 not visibly diseased, may be shipped interstate 

 for immediate slaughter in cars so marked. 



139. Foot and Mouth Disease. For various rea- 

 sons, the regulations used for the restriction of the 

 foot and mouth disease are less permanent in char- 

 acter than those for the other infectious diseases. 

 The nature of the germ, and its manner of com- 

 munication, are less definitely known. In conse- 

 quence the regulations must of necessity show an 

 element of experimental uncertainty. Infected 

 animals cannot be shipped. Other animals when 

 shipped must bear with them certificates or affi- 

 davits of owners showing that they have been in 

 the district from which shipped for sixty days 

 before shipment, and that they have not recently 

 been in a public stock yard. The quarantined 

 area is divided, by the last orders issued, into four 

 sub-areas. (1) Closed area; into which cattle, 



