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 eattle, 
