174 ESSENTIALS OF VETERINARY LAW 
evasion of the law, and get his product into con- 
sumption in some other place or way. 
125. Veterinary Authority in Milk Industry. 
A veterinarian’s governmental authority cannot 
extend beyond the limits of the authority of the 
body under whom he has been appointed. (§ 99.) 
The foregoing outline shows that the authority of 
a veterinarian in the conduct of the milk business 
is very slight and inconspicuous, as compared 
with that of other inspectors. As a city employee 
he has no authority outside of the city by which he 
has been appointed, and in the dairy district he 
acts in an advisory capacity. Of course his advice 
as to the condition of a dairy may cause the city 
to refuse the product of the dairy. A state veteri- 
narian has authority within his own state, and his 
advice may enable the state officers to exclude milk 
from certain outside territory. The veterinarian 
employed by the federal government has no 
authority except with regard to products intended 
for interstate or foreign shipment. 
126. Dairy Products. It is now known that the 
germs of tuberculosis and typhoid fever may 
remain viable for a time in butter and cheese. The 
aging of cheese before sale tends to lessen the 
danger in that article from those bacteria, but it 
is liable to another infection with a highly poison- 
ous germ—tyrotoxicon. These dairy products are 
frequent and extensive subjects of interstate com- 
merce, and to a smaller degree they enter foreign 
commerce. It is practically impossible to effi- 
ciently supervise the commerce without attention 
to the manufacture. It is entirely within the 
authority of Congress to enact reasonable statutes 
