CHAPTER I THE PROBLEM DEFINED What is sex? Asexual and mixed reproduction; Origin of sexual reproduction; Advantage of sex in chance of survival; Germ and body cells; Limitations of biology in social problems; Sex always present in higher animals; Sex in mammals; The sex problem in the human species; Application of laboratory method. Sex, like all complicated phenomena, defies being crowded into a simple definition. In an animal or... more...

SEXUAL INVERSION. CHAPTER I.—INTRODUCTION. Homosexuality Among Animals—Among the Lower Human Races—The Albanians—The Greeks—The Eskimos—The Tribes of the Northwest United States—Homosexuality Among Soldiers in Europe—Indifference Frequently Manifested by European Lower Classes—Sexual Inversion at Rome—Homosexuality in Prisons—Among Men of Exceptional Intellect and Moral... more...

SEX UNIVERSAL AND ETERNAL The fundamental basis of the universe is Sex. Sex is the fulcrum upon which our life-activities turn. It is the life of Man and of planets, and ignorance of the laws of Sex is the cause of death of both. It is the conjunction of the forces of attraction and repulsion; the positive and negative; the centripetal and centrifugal forces which hold stars and planets in their orbits—or rather, it is the two expressions... more...

I THE SEXUAL ABERRATIONS The fact of sexual need in man and animal is expressed in biology by the assumption of a "sexual impulse." This impulse is made analogous to the impulse of taking nourishment, and to hunger. The sexual expression corresponding to hunger not being found colloquilly, science uses the expression "libido." Popular conception makes definite assumptions concerning the nature and qualities of this sexual impulse. It is... more...

Chapter I THE ELEMENTS OF MEMORY Four Special Memory Processes You have learned of the sense-perceptive and judicial processes by which your mind acquires its knowledge of the outside world. You come now to a study of the phenomenon of memory, the instrument by which your mind retains and makes use of its knowledge, the agency that has power to resurrect the buried past or power to enfold us in a Paradise of dreams more perfect than reality.... more...

SENSES. Sight.—Light.—Five minutes after birth, slight sensibility to light (2). Second day, sensitiveness to light of candle (3). Sixth and seventh days, pleasure in moderately bright daylight (3, 4). Ninth and tenth days, sensitiveness greater at waking than soon afterward (3). Sleeping babes close the eyes more tightly when light falls on the eyes (4). Eleventh day, pleasure in light of candle and in bright object (3).... more...

EDITOR’S INTRODUCTION The present volume appeals to the editor of this series as one of the most significant books, viewed from the standpoint of the future of our educational theory and practice, that has been issued in years. Not only does the volume set forth, in language so simple that the layman can easily understand, the large importance for public education of a careful measurement of the intelligence of children, but it also... more...

MUIRHEAD LIBRARY OF PHILOSOPHY An admirable statement of the aims of the Library of Philosophy was provided by the first editor, the late Professor J. H. Muirhead, in his description of the original programme printed in Erdmann's History of Philosophy under the date 1890. This was slightly modified in subsequent volumes to take the form of the following statement: "The Muirhead Library of Philosophy was designed as a contribution to the History... more...

CHAPTER IATTAINMENT OF MIND CONTROL The Man of Tomorrow The men of the nineteenth century have harnessed the forces of the outer world. The age is now at hand that shall harness the energies of mind, new-found in the psychological laboratory, and shall put them at the service of humanity. Are you fully equipped to take a valiant part in the work of the coming years? The Dollars and Cents of Mental Waste The greatest of all eras is at hand!... more...

Chapter I MENTAL SECOND WIND Sticking to the Job Are you an unusually persevering and persistent person? Or, like most of us, do you sometimes find it difficult to stick to the job until it is done? What is your usual experience in this respect? Is it not this, that you work steadily along until of a sudden you become conscious of a feeling of weariness, crying "Enough!" for the time being, and that you then yield to the impulse to stop? The... more...