Moreover, a vast amount of valuable information on which it is possible to build up a knowledge of the correlated characteristics of families, already lies at present unused in the great insurance offices and elsewhere. When it is possible to obtain a large collection of accurate pedigrees for scientific purposes, and to throw them into a properly tabulated form, we shall certainly be in a position to know more of the qualities of stocks, of their good and bad characteristics, and of the degree in which they are correlated.
In this way we shall, in time, be able to obtain a clear picture of the probable results on the offspring of unions between any kind of people.
From personal and ancestral data we shall be able to reckon the probable quality of the offspring of a married couple. Given a man and woman of known personal qualities and of known ancestors, what are likely to be the personal qualities, physical, mental and moral, of the children?
That is a question of immense importance both for the beings themselves whom we bring into the world, for the community generally, and for the future race.
Eventually, it seems evident, a general system, whether private or public, whereby all personal facts, biological and mental, normal and morbid, are duly and systematically registered, must become inevitable if we are to have a real guide as to those persons who are most fit, or most unfit, to carry on the race.5 Unless they are full and frank such records are useless. But it is obvious that for a long time to come such a system of registration must be private. According to the belief which is still deeply rooted in most of us, we regard as most private those facts of our lives which are most intimately connected with the life of the race, and most fateful for the future of humanity. The feeling is no doubt inevitable; it