Nor is this argument, as I see it and will present it, invalidated in any degree by the case of such individuals as the sterile worker-bee; any more than the argument, rightly considered, is invalidated by any instance of a worthy, valuable, happy life, eminently a success in the highest and in the lower senses, lived amongst mankind by a non-parent of either sex. On the contrary, it is in such cases as that of the worker-bee that we find the warrant--in apparent contradiction--for our notion of the meaning of the individual, and also the key to the problem placed before us amongst ourselves by the case of inevitable spinsterhood. Here, it must be granted, is an individual of a very high and definite and individually complete type, no accident or sport, but, in fact, essential for the type and continuance of the species to which she belongs, and yet, though highly individualized and worthy to represent individuality at its best and highest, the worker-bee, so far from being designed for parenthood, is sterile, and her distinctive characters and utilities are conditional upon her sterility. But when we come to ask what are her distinctive characters and utilities we find that they are all designed for the future of the race. She is, in fact, the ideal foster-mother, made for that service, complete in her incompleteness, satisfied with the vicarious fulfilment of the whole of motherhood except its merely physical part. The doctrine, therefore, that the individual is designed by Nature for parenthood, the individual being primarily devised for the race, finds no exception, but rather a striking and immensely significant illustration in the case of the worker-bee, nor will it find itself in difficulties with the case of any forms of individual, however sterile, that can be quoted from either the animal or the vegetable world. Natural selection, of which the continuance of the race is the first and never neglected concern, invariably sees to it that no individuals are allowed to be produced by any species unless they have survival-value, a phrase which always means, in the upshot, value for the survival of the race--whether as parents, or foster-parents, protectors of the parents, feeders or slaves thereof. Our primary purpose throughout being practical, it is impossible to devote unlimited time and space to proceeding formally through the known forms of life in order to marshal all the proofs or a tithe of them, that all individuals are invented and tolerated by Nature for parenthood or its service.