Some years previously I had made the acquaintance of an American whose sympathies were enlisted on my behalf by perusal of some of my books or essays--Mr. E. A. Silsbee, of Salem, Mass. While yet the circular was in its unfinished state, I sent to him a copy, accompanied by the inquiry whether he thought that subscribers might be obtained in America. His reply, dated February 14, held out much encouragement; and a letter of March 6, written after the circular had been sent to New York, contained a sentence the significance of which was shown by subsequent events. The sentence runs--"Mr. Youmans, a very popular and intelligent lecturer on scientific subjects, well known by his works on chemistry, physiology, etc., entered with great enthusiasm into the project." Devoting himself with characteristic vigor to the furtherance of my scheme, this previously unknown friend succeeded in obtaining more than two hundred subscribers. [Footnote 51: From Part VII of the "Autobiography." Copyright, 1904, by D. Appleton & Co.] The relation thus initiated was extremely fortunate; for Prof. Edward L. Youmans[52] was of all Americans I have known or heard of, the one most able and most willing to help me. Alike intellectually and morally, he had in the highest degrees the traits conducive to success in diffusing the doctrines he espoused; and from that time to this he has devoted his time mainly in spreading throughout the United States the doctrine of evolution. His love of wide generalizations had been shown years before in lectures on such topics as the correlation of the physical forces; and from those who heard him I have gathered that, aided by his unusual powers of exposition, the enthusiasm which contemplation of the larger truths of science produced in him was in a remarkable degree communicated to his hearers. Such larger truths, I have on many occasions observed, are those which he quickly seizes--ever passing at once through details to lay hold of essentials; and having laid hold of them, he clearly sets them forth afresh in his own way with added illustrations. But it is morally even more than intellectually that he has proved himself a true missionary of advanced ideas. Extremely energetic--so energetic that no one has been able to cheek his over-activity--he has expended all his powers in advancing what he holds to be the truth; and not only his powers but his means. It has proved impossible to prevent him from injuring himself in health by his exertions; and it has proved impossible to make him pay due regard to his personal interests. So that toward the close of life he finds himself wrecked in body and impoverished in estate by thirty years of devotion to high ends. Among worshipers of humanity, who teach that human welfare should be the dominant aim, I have not heard of one whose sacrifices will bear comparison with those of my friend.