The mere fact that a man is an engineer or a doctor, for example, should imply now, and certainly will imply in the future, that he has received an education of a certain definite type; he will have a general acquaintance with the scientific interpretation of the universe, and he will have acquired certain positive and practical habits of mind. If the methods of thought of any individual in this central body are not practical and positive, he will tend to drift out of it to some more congenial employment. He will almost necessarily have a strong imperative to duty quite apart from whatever theological opinions he may entertain, because if he has not such an inherent imperative, life will have very many more alluring prospects than this. His religious conclusions, whatever they may be, will be based upon some orderly theological system that must have honestly admitted and reconciled his scientific beliefs; the emotional and mystical elements in his religion will be subordinate or absent. Essentially he will be a moral man, certainly so far as to exercise self-restraint and live in an ordered way. Unless this is so, he will be unable to give his principal energies to thought and work--that is, he will not be a good typical engineer. If sensuality appear at all largely in this central body, therefore,--a point we must leave open here--it will appear without any trappings of sentiment or mysticism, frankly on Pauline lines, wine for the stomach's sake, and it is better to marry than to burn, a concession to the flesh necessary to secure efficiency. Assuming in our typical case that pure indulgence does not appear or flares and passes, then either he will be single or more or less married. The import of that "more or less" will be discussed later, for the present we may very conveniently conceive him married under the traditional laws of Christendom. Having a mind considerably engaged, he will not have the leisure for a wife of the distracting, perplexing personality kind, and in our typical case, which will be a typically sound and successful one, we may picture him wedded to a healthy, intelligent, and loyal person, who will be her husband's companion in their common leisure, and as mother of their three or four children and manager of his household, as much of a technically capable individual as himself. He will be a father of several children, I think, because his scientific mental basis will incline him to see the whole of life as a struggle to survive; he will recognize that a childless, sterile life, however pleasant, is essentially failure and perversion, and he will conceive his honour involved in the possession of offspring.