They know, for example, something about the conditions under which coal miners work, and they can see that it is contrary to public interests that men should toil underground, at arduous labor, twelve hours a day.

Accidents result with painful frequency, and these are bad things,--bad for miners and mine owners alike.

They are bad for the whole community.

Therefore the regulation of miners' hours of labor comes legitimately under the police powers of the law.
The learned judges, I say this with all due respect, do not know anything about working women.

Their own words prove it.