I found, the other day, that an address upon Heredity had been announced, of which I was to be the deliverer. I admit that I was fully responsible for the statement, although, for reasons with which I need not trouble you, I was not quite prepared for it in this form. I mention this fact in order simply to say that the title may possibly give rise to false expectations. I am quite incompetent to express any opinion of the slightest scientific value upon certain problems suggested by that rather ugly word "heredity". The question as to the precise relationship between any organism and its parents or remoter ancestors, is one of the highest interest. The solution, for example, of the problem, whether is it possible for a living being to transmit to its descendants qualities which have only been acquired during its own lifetime, has an important bearing upon the general theory of evolution. But I have nothing whatever to suggest in regard to that problem. I simply take it for granted that there is some relation between parents and children: and a relation, speaking in the most general way, such that the qualities with which we start in life, resemble more or less closely those of our ancestors. I may also assume that, in some form or other, the doctrine of evolution must be accepted: and that all living things now in the world are the descendants, more or less modified, of the population which preceded them. I proceed to ask whether, as some people appear to believe, the acceptance of this doctrine in the most unqualified form, would introduce any difficulty into our primary ethical conceptions. I will also at once give my answer. I do not believe that it introduces any difficulty whatever. I do believe that the general theory of evolution tends in very important ways to give additional distinctness to certain ethical doctrines; although, to go at all fully into the how and the why would take me beyond my present purpose. All that I have to argue to-day is, that a belief in "heredity" need not be a stumbling-block to any reasonable person.