A number of years ago a reader of one of your earlier works on radio-active substances noted the observation that there was much divergence of opinion as to whether the energy of radio-active substances is created within those substances themselves, or is gathered to them from outside sources, and then diffused from them. The question suggested an answer which is doubtless hopelessly unscientific. I have liked to believe in an analogy between the spiritual and the physical world. I have been very sure that that which I may call the radio-active soul, or spirit, or intellect--call it what you choose--must first gather to itself, from its surroundings, the power that it afterwards radiates in beneficence to those near it. I believe it is the sum of many inspirations, borne in on great souls, which enables them to warm, to scintillate, to radiate, to illumine and serve those about them. I am so sure of this explanation for the radio-active personality that I feel somehow a conviction that science will one day establish a like explanation for radioactivity among inanimate substances. Perhaps, in my innocence of science, I am airily rushing in where scientists fear to tread. But I am trying to express to you my conviction that the great things achieved by great minds would never have been wrought without the inspiration of an appealing need for them. That appeal comes as inspiration to successful effort, and success in turn enables the outgiving of benefits to millions whose only contribution has been the power of their united appeal. Let me press the analogy a little farther. The world to-day is appealing to its statesmen, its sociologists, its humanitarians, and its religious leaders for solution of appalling problems. I want to hope that the power and universality of that appeal will inspire strong, devout, consecrated men and women to seek out the solution, and, in the light of their wisdom, to carry it to all mankind. I have faith to believe that precisely that will happen; and in your own career of fine achievement I find heartening justification for my faith.