=Utilization of Family Pride as a Basis for Constructive Eugenics.--=There are few more powerful incentives to make the best of one's abilities, or few greater deterrents from vice than family pride; and there is no reason why this same sentiment may not be aroused in behalf of unborn generations. The sentiment of caste or aristocracy in some form is well nigh universal in mankind. The family of Mr. A came over in the Mayflower and is therefore worlds above the family of Mr. B, who arrived fifty years later. Mr. X's income is $5,000 a year, Mr. Y's only $1,500. The poor family in the front suite of the tenement regards itself as far superior to the one in the rear. Among criminals the professional house-breaker feels himself to be of higher caste than the sneak-thief, and in turn is surpassed by the bank-burglar. Even in the insane asylum the feeling is rampant. With such a wide-spread tendency for a foundation the creation of a sentiment of eugenic aristocracy is by no means a visionary undertaking. =The Tendency for Like to Marry Like.--=Even now there is a decided though unconscious tendency for like to marry like and thus create particular strains. We have lines, for instance, which produce notably families of scholars, others which yield mainly statesmen, and still other strains of inventors, of financiers, of naval men, of soldiers, and of actors respectively. And there is little doubt that people, with the facts of inheritance of ability once before them, will be led to act more or less in accordance with their knowledge. On the other hand, due apparently to the same unconscious tendency for like to marry like, we find produced criminalistic, feeble-minded, deaf-mute and tubercular stocks. The first type of family is often termed _aristogenic_ and the second or defective type, _cacogenic_. =Public Opinion as an Incentive to Action.--=Much of our social conduct is the result of the pressure of public opinion, yet so accustomed are we to this that we ordinarily do not feel it as a hardship. There is little doubt that similarly the more wholesome attitude toward parenthood advocated by the eugenist would be taken as a matter of course, once the idea became prevalent. It would come to be one of those socially preconceived ideas which are as much actualities and which become unconscious guides to action no less certainly than do the more obvious personal habits of the individual. And just in the degree that we as a race get the "feeling" that intellect, morals and skill are highly desirable attributes in marriage selection, just in that degree will one's affections in their earlier stages gravitate toward individuals who possess such qualities in high degree. In the main, those stocks which have shown by ancestral as well as personal achievement their superiority will tend to insure most certainly a continuation of this superiority in offspring.