realm. We inherit, for instance, instincts, the forms of nervous mechanism which enable us to act usefully without having learned. We inherit temperaments and dispositions, which define our general emotional and practical attitude to the world. Most important of all, we inherit capacities, and our capacities include all that we are capable of becoming in intellect, in morality, in art, and in religion. What we inherit is not specific ability but general capacity. The son of a woman who is strong intellectually or morally may not be strong in exactly the same way as his mother, but he is likely to be strong in some way. The son of a great mathematician may not be a great mathematician, but his general mental capacities will probably be above the average. The child does not inherit the special ability or peculiar virtue of his parents, but he does inherit general capacities and general tendencies, which may express themselves in one way or another. The way in which they develop is determined by environment and training.
The capacities which we inherit form a limit beyond which we cannot advance. In the physical realm the limit of capacity is readily recognised; and our physical heredity sets up absolute barriers beyond which we cannot pass. It is equally true that the extent of our mental acquisitions is limited by our inherited intellectual capacities. The teacher cannot make a first-class mathematician out of a child whose inherited capacity is mediocre. But we are usually far too apt to suppose that we have reached the limit of our mental capacities long before we really have. Most people regularly live
