It is with great pleasure that I pay a tribute of appreciation to the excellent service of Dr. Winfield S. Hall, in his presentation to audiences of young men of the vital problems of sexual hygiene. With the intelligence of a trained and experienced physician, with the thoroughness and frankness of an expert teacher and with the delicacy and motive of a Christian gentleman, he presents the "Young Man's Problem" in such a way as to make him, in my judgment, one of the most helpful counselors of young men on the American platform today. Sincerely, W.M. WOOD. University of Notre Dame. Winfield Scott Hall, M.D., Northwestern University Medical School. My Dear Dr. Hall: In your lecture on "The Young Man's Problem" and in your book on "Sexual Hygiene" you are doing a great service for the rising generation. I am convinced that one great source of vice is ignorance about the matters touched upon in your lecture and book. Priests are constantly giving instruction on these same points, but it is a distinct advantage to have their teaching reinforced by a distinguished physician, expressing himself with the plainness of the laity and speaking always in a most reverential spirit. For students seventeen years of age or more your presentation of this difficult subject will be a God-send, for it abates curiosity, dissipates ignorance, warns of perils and arouses a manly desire for a clean life. Very sincerely yours, JOHN CAVANAUGH, C.S.C., President. Central Department, Young Men's Christian Association, Chicago. October 21, 1908. Dr. Winfield S. Hall, Northwestern University Medical School. My Dear Dr. Hall: Our committee wants to know if we cannot arrange a date with you this year to deliver your lecture on "The Young Man's Problem." I also want some more of your books on Reproduction and Sexual Hygiene. I cannot forbear to express my very hearty appreciation of the splendid service you have done and are doing to the young manhood of our country in this lecture and this book. I have never heard a presentation of the subject which takes hold so deeply upon thoughtful men, and your book is by all odds the best thing in print on this subject. Your scientific, yet popular method and the absence of vague moralizing are convincing and inspiring in their effects. I trust we may hear you this year. Very truly yours, HERBERT W. GATES, Secy., Religious Work. THE SECRET OF MANHOOD