"The connected arrangement of the essays which their reissue permits brings into fuller relief Mr. Huxley's masterly powers of exposition. Sweeping the subject-matter clear of all logomachies, he lets the light of common day fall upon it. He shows that the place of hypothesis in science, as the starting point of verification of the phenomena to be explained, is but an extension of the assumptions which underlie actions in everyday affairs; and that the method of scientific investigation is only the method which rules the ordinary business of life."--_London Chronicle._ _THE SYNTHETIC PHILOSOPHY OF HERBERT SPENCER_. In nine volumes. 12mo. Cloth, $2.00 per volume. The titles of the several volumes are as follows: (1.) FIRST PRINCIPLES. I. The Unknowable. II. Laws of the Knowable. (2.) THE PRINCIPLES OF BIOLOGY. Vol. I. I. The Data of Biology. II. The Inductions of Biology. III. The Evolution of Life. (3.) THE PRINCIPLES OF BIOLOGY. Vol. II. IV. Morphological Development. V. Physiological Development. VI. Laws of Multiplication. (4.) THE PRINCIPLES OF PSYCHOLOGY. Vol. I. I. The Data of Psychology. II. The Inductions of Psychology. III. General Synthesis. IV. Special Synthesis. V. Physical Synthesis. (5.) THE PRINCIPLES OF PSYCHOLOGY. Vol. II. VI. Special Analysis. VII. General Analysis. VIII. Congruities. IX. Corollaries. (6.) THE PRINCIPLES OF SOCIOLOGY. Vol. I. I. The Data of Sociology. II. The Inductions of Sociology. III. The Domestic Relations. (7.) THE PRINCIPLES OF SOCIOLOGY. Vol. II. IV. Ceremonial Institutions. V. Political Institutions. (8.) THE PRINCIPLES OF SOCIOLOGY. Vol. III. VI. Ecclesiastical Institutions. VII. Professional Institutions. VIII. Industrial Institutions. (9.) THE PRINCIPLES OF ETHICS. Vol. I. I. The Data of Ethics. II. The Inductions of Ethics. III. The Ethics of Individual Life. (10.) THE PRINCIPLES OF ETHICS. Vol. II. IV. The Ethics of Social Life: Justice. V. The Ethics of Social Life: Negative Beneficence. VI. The Ethics of Social Life: Positive Beneficence. _DESCRIPTIVE SOCIOLOGY. A Cyclopædia of Social Facts_. Representing the Constitution of Every Type and Grade of Human Society, Past and Present, Stationary and Progressive. By HERBERT SPENCER. Eight Nos., Royal Folio.