178 ESSENTIALS OF VETERINARY LAW 
area may be made at any time by boat or rail for 
immediate slaughter, provided that the permission 
has first been obtained from the proper official of 
the state (or District of Columbia), at the place 
of destination, under certain strict regulations. 
They must not be handled over platforms, chutes 
or alleys used for horses, mules or asses, nor for 
cattle from noninfected areas. The construction 
of the alleys, chutes, pens, etc., is strictly regu- 
lated to prevent any possible contact with other 
animals, and the pens must be plainly marked with 
signs, ‘‘QUARANTINED YARDS,”’ or ‘‘QUAR- 
ANTINED PENS.’’ Any cattle driven into these 
specially reserved pens must be treated as if ex- 
posed. Cars or boats used in the transportation 
of such animals must be conspicuously marked. 
Cattle from noninfected areas, needing to be un- 
loaded for feed and water, within the infected 
territory, can only be so handled in specially re- 
served pens, properly labeled ‘‘NONINFECTIOUS 
PENS,’’ and kept free from possible infection. 
Cattle from noninfectious areas, infested with the 
tick, Margaropus annulatus, must be regarded as 
infected cattle, and subject to the regulations 
therefor. Cattle from infected areas, or other cat- 
tle infected with the ticks, after having been prop- 
erly dipped twice, at intervals of from 5 to 12 days, 
by the approved method, may be certified as free 
from infection with splenic fever, and may be 
moved interstate for any purpose. If dipped once 
they may be shipped as ‘‘dipped ticky cattle,’’ and 
if examined and found free in a market centre pro- 
vided with proper dipping facilities, and there 
dipped by an inspector within from 5 to 12 days 
