170 ESSENTIALS OF VETERINARY LAW 
city of New York, of milk not produced by him 
under conditions specified by the department. It 
had the right to exact from all shippers of milk 
a compliance with such conditions as would rea- 
sonably tend to a pure product for the use of the 
citizens as a condition for permitting its sale in 
the city of New York.’’ 
An ordinance forbidding the feeding of cattle 
on distillery slops, and prohibiting the sale of the 
milk of cattle so fed was upheld as a proper use 
of police power.*® 
Modern sociologic and commercial conditions 
have very materially changed the relationship of 
the milk industry to public health. Formerly the 
milk was delivered to the customer within a few 
hours at the most after milking; the cows were 
generally within easy inspection by the customer; 
and an infected pail of milk could endanger few 
persons. Now the milk for our large cities must 
be transported from large areas, often outside of 
the state in which it is consumed. The customer 
does not even know, as a rule, from what state his 
supply comes. A pail of milk which is infected 
at the milking may infect several carloads at a 
bottling plant, and the time between milking and 
delivery is such that there may be a great multi- 
plication of a few bacteria. <A strict supervision 
of the industry is therefore an urgent govern- 
mental responsibility. 
It is now generally recognized that bovine tuber- 
culosis may be the cause of much of the disease 
in the human being, though this was formerly 
16 Johnson v. Simonton, 43 
Cal. 242. 
