THE PROBLEM OF THE BIRTH SUPPLY
conclusive works, can be demonstrated to consist in a similar miscellany. He speaks of "eminence," of "success," of "ability," of "zeal," and "energy," for example, and except for the last two items I would submit that these qualities though of enormous personal value are of no practical value in inheritance whatever; that to wed "ability" to "ability" may breed something less than mediocrity, and that "ability" is just as likely or just as unlikely to be prepotent and to assert itself in descent with the most casually selected partner as it is with one picked with all the knowledge, or rather pseudo- knowledge, anthropology in its present state can give us.
When, however, we turn to "zeal" or "energy" or "go," we do seem to be dealing with a simpler and more transmissible thing. Let us assume that in this matter there is a wide range of difference that may be arranged in a direct and simple scale in quantitative relation to the gross output of action of different human beings. One passes from the incessant employment of such a being as Gladstone at the one extreme, a loquacious torrent of interests and achievements, to the extreme of phlegmatic lethargy on the other. Call the former a high energetic and the latter low. Quite possibly it might be found that we could breed "high energetics." But before we did so we should have to consider very gravely that the "go" and "energy" of a man have no ascertainable relation to many other extremely important considerations. Your energetic person may be moral or immoral, an unqualified egotist or as
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