I selected as illustrations those social questions which seemed to me most significant for our period. A few of them admitted an approach with experimental methods, others merely a dissection of the psychological and psychophysiological roots. The problems of sex, of socialism, and of superstition seemed to me especially important, and if some may blame me for overlooking the problem of suffrage, I can at least refer to the chapter on the jury, which comes quite near to this militant question. Most of this material appears here for the first time. The chapter on thought transference, however, was published in shorter form in the _Metropolitan Magazine_, that on the jury, also abbreviated, in the _Century Magazine_, and that on naïve psychology in the _Atlantic Monthly_. The paper on sexual education is an argument, and at the same time an answer in a vivid discussion. Last summer I published in the New York _Times_ an article which dealt with the sex problem. It led to vehement attacks from all over the country. The present long paper replies to them fully. I hope sincerely that it will be my last word in the matter. The advocates of sexual talk now have the floor; from now on I shall stick to the one policy in which I firmly believe, the policy of silence. HUGO MÜNSTERBERG. Cambridge, Mass., January, 1914. CONTENTS CHAPTER PAGE PREFACE vii I. SEX EDUCATION 3 II. SOCIALISM 71 III. THE INTELLECTUAL UNDERWORLD 113 IV. THOUGHT TRANSFERENCE 141 V. THE MIND OF THE JURYMAN 181 VI. EFFICIENCY ON THE FARM 205 VII. SOCIAL SINS IN ADVERTISING 229 VIII. THE MIND OF THE INVESTOR 253 IX. SOCIETY AND THE DANCE 273 X. NAÏVE PSYCHOLOGY 291 PSYCHOLOGY AND SOCIAL SANITY I SEX EDUCATION