She can show how useful the knowledge of chastity is to a boy-the strength that comes from self-control, the weakness that follows self-indulgence, the danger to himself and to those he really loves when he contaminates himself with prostitutes. A young man once said to a friend of mine, "Oh! if my mother had only warned me of the suffering I would cause myself and others, I never would have polluted my body and shamed my soul." The nurse should know how to instruct the mother as to the signs of self-abuse in her little boys, so that she may know what causes the nervous movements, the pallor, the fitful appetite, the dark circles under the eyes, the listlessness, the fondness for being alone--any one of which should call for extreme watchfulness. All these things a nurse should be sure to know, so that, as far as in her lies, she should be one more earnest woman striving to make the world better for her having lived and worked in it. A wise man has given this quaint description of a perfectly educated man: "When a man knows what he knows, when he knows what he does not know, when he knows where to go for what he should know, I call that a perfectly educated man." So with the nurse. When she finds a social problem with which she is not familiar, let her turn to this list of books, magazine articles, and pamphlets upon the subject: Chapman, Rose R., The Moral Problems of Children; Dock, Lavinia L., Hygiene and Morality; Hall, Winfield Scott, Reproduction and Sexual Hygiene; Henderson, Charles W., Education with Reference to Sex; Lyttelton, E., Training of the Young in the Laws of Sex; Morley, Margaret W., The Renewal of Life; Morrow, Dr. P. A., Social Diseases and Marriage; Saleeby, Caleb W., Parenthood and Race Culture; Wilson, Dr. Robert N., The American Boy and the Social Evil, The Nobility of Boyhood, 50 cents (contained in "The American Boy and the Social Evil"); Hall, Stanley, Educational Problems, Chapter on the Pedagogy of Sex, Adolescence, Youth; Northcoate, H., Christianity and Sex Problems; Janney, Dr. Edward O., The White Slave Traffic in America; Report of the 3 8th Conference of Charities and Corrections, in Boston, June, 1911, Sex-Hygiene Section; Kauffman, Reginald Wright, The House of Bondage; Summary of the Chicago Vice Commission, in the May number of _Vigilance_; Education with Reference to Sex in the August number of _Vigilance_ (published monthly at 156 Fifth Ave., New York City, at five cents per copy); The Cause of Decency, Theodore Roosevelt, _Outlook_, July 15, 1911; articles on The Causes of Prostitution in _Collier's Weekly_, from time to time, since April 1, by Reginald Wright Kauffman; articles on the Necessity for Teaching Sex Hygiene, in _Good Housekeeping_, beginning with the September number; Dr. Dale's articles on Moral Prophylaxis, in the JOURNAL OF NURSING since the July number; Instructing Children in the Origin of Life, Elisabeth Robinson Scovil, in October JOURNAL OF NURSING; Leaflets and pamphlets