It is not really difficult to sum up the essence of Eugenics: though some of the Eugenists seem to be rather vague about it. The movement consists of two parts: a moral basis, which is common to all, and a scheme of social application which varies a good deal. For the moral basis, it is obvious that man's ethical responsibility varies with his knowledge of consequences. If I were in charge of a baby (like Dr. Johnson in that tower of vision), and if the baby was ill through having eaten the soap, I might possibly send for a doctor. I might be calling him away from much more serious cases, from the bedsides of babies whose diet had been far more deadly; but I should be justified. I could not be expected to know enough about his other patients to be obliged (or even entitled) to sacrifice to them the baby for whom I was primarily and directly responsible. Now the Eugenic moral basis is this; that the baby for whom we are primarily and directly responsible is the babe unborn. That is, that we know (or may come to know) enough of certain inevitable tendencies in biology to consider the fruit of some contemplated union in that direct and clear light of conscience which we can now only fix on the other partner in that union. The one duty can conceivably be as definite as or more definite than the other. The baby that does not exist can be considered even before the wife who does. Now it is essential to grasp that this is a comparatively new note in morality. Of course sane people always thought the aim of marriage was the procreation of children to the glory of God or according to the plan of Nature; but whether they counted such children as God's reward for service or Nature's premium on sanity, they always left the reward to God or the premium to Nature, as a less definable thing. The only person (and this is the point) towards whom one could have precise duties was the partner in the process. Directly considering the partner's claims was the nearest one could get to indirectly considering the claims of posterity. If the women of the harem sang praises of the hero as the Moslem mounted his horse, it was because this was the due of a man; if the Christian knight helped his wife off her horse, it was because this was the due of a woman. Definite and detailed dues of this kind they did not predicate of the babe unborn; regarding him in that agnostic and opportunist light in which Mr. Browdie regarded the hypothetical child of Miss Squeers. Thinking these sex relations healthy, they naturally hoped they would produce healthy children; but that was all. The Moslem woman doubtless expected Allah to send beautiful sons to an obedient wife; but she would not have allowed any direct vision of such sons to alter the obedience itself. She would not have said, "I will now be a disobedient wife; as the learned leech informs me that great prophets are often the children of disobedient wives." The knight doubtless hoped that the saints would help him to strong