The proportion of the unfit to the fit is in consequence annually increasing.
10.

The _future_ of society demands that compulsory sterilization of the unfit should be adopted.
11.

No method ever tried or suggested offers the advantages of simplicity, safety, effectiveness, and popularity, promised by tubo-ligature.
12.

The State must protect itself against the collateral danger of artificial sterilization of its best stock.
The highest interest of Society and of the individual urgently requires that the size of families be controlled.
The moral restraint of Malthus (delayed marriage) and post-nuptial intermittent restraint are the only safe and rational methods, that our civilization can possibly encourage, or physiology endorse.
These methods must of necessity be peculiar to the best class of people.
For the worst class of people, induced sterility, or prohibited fertility, is an absolute necessity, if Society and civilization must endure.
Now what are likely to be the results of, first, the moral methods, and, second, the surgical method of our curtailment.
"It does not appear to me," says Dr.Billings (Forum, June, 1893), "that this lessening of the birth-rate is in itself an evil, or that it will be worth while to attempt to increase the birth-rate merely for the sake of maintaining a constant increase in the population, because to neither this nor the next generation will such increase be specially beneficial." To Aristotle, the great advantage of an abundant population was, that the State was secured against invasion by numerous defenders.
If we can find no stronger justification for a teeming population than this to-day, we will be forced to agree with Dr.Billings, that neither to this nor the next generation, is a great increase especially beneficial.
But the moral effect of judicial limitation is very great.

If men and women can marry young, one great incentive to vice is removed.