In reply to the second allegation,—­that the act in question was class legislation, as it did not apply equally to all persons similarly situated,—­the plaintiff answered that the specific prohibition of more than ten hours’ work in a laundry was not an arbitrary discrimination against that trade; because the present character of the business and its special dangers of long hours afford strong reasons for providing a legal limitation of the hours of work in that industry as well as in manufacturing and mechanical establishments.  Statements from industrial and medical authorities described conclusively the present character of the laundry business.

Mr. Brandeis finally submitted that, in view of all these facts, the present Oregon statute was within Oregon’s police power, as its public health and welfare did require a legal limitation of the hours of women’s work in manufacturing and mechanical establishments and in laundries.

Justice Brewer delivered the opinion of the Supreme Court of the United States.  The case was won.  Here are, in part, the words of the decision:—­

It may not be amiss in the present case, before examining the constitutional question, to notice the course of legislation as well as expressions of opinion from other judicial sources.  In the brief filed by Mr. Brandeis ... is a copious collection of all these matters.  The ... legislation and opinions referred to ... are significant of a widespread belief that woman’s physical structure and the special functions she performs in consequence thereof, justify special legislation restricting or qualifying the conditions under which she should be permitted to toil.

Constitutional questions, it is true, are not settled by even a consensus of present public opinion....  At the same time, when a question of fact is debated and debatable, and the extent to which a special constitutional limitation goes is affected by the truth in respect to the fact, a widespread and long-continued belief concerning it is worthy of consideration.  We take judicial cognizance of all matters of general knowledge....

That woman’s physical structure and the performance of maternal functions place her at a disadvantage in the struggle for subsistence is obvious.  This is especially true when the burdens of motherhood are upon her.  Even when they are not, by abundant testimony of the medical fraternity, continuance for a long time on her feet at work, repeating this from day to day, tends to injurious effects upon her body, and as healthy mothers are essential to vigorous offspring, the physical well-being of woman becomes an object of public interest and care in order to preserve the strength and vigor of the race.

Nobody knowing the actual strain upon women laundry workers, no one who had seen them lying motionless and numb with fatigue at the end of a long day, or foregoing food itself for the sake of rest, could listen unmoved to these thrilling words of the greatest court of our country.