[O] This article was written and read to the Faculty of Harvard College shortly after Lord Coleridge's visit to the United States, in the autumn of 1883.
[P] An address delivered at the opening of the Summer School of Chemistry at Harvard College, July 7, 1884.
[Q] An Address to College Students at the close of a course of lectures on Egypt and her Monuments. Illustrated by lantern photographs.
SCIENTIFIC LECTURES AND ESSAYS.
Popular Lectures on Scientific Subjects. By H. Helmholtz, Professor of Physics in the University of Berlin. First Series. Translated by E. Atkinson, Ph. D., F. C. S. With an Introduction by Professor Tyndall. With 51 Illustrations. 12mo. Cloth, $2.00.
CONTENTS.—On the Relation of Natural Science to Science in General.—On Goethe's Scientific Researches.—On the Physiological Causes of Harmony in Music.—Ice and Glaciers.—Interaction of the Natural Forces.—The Recent Progress of the Theory of Vision.—The Conservation of Force.—Aim and Progress of Physical Science.
Popular Lectures on Scientific Subjects. By H. Helmholtz. Second Series. 12mo. Cloth, $1.50.
CONTENTS.—Gustav Magnus.—In Memoriam.—The Origin and Significance of Geometrical Axioms.—Relation of Optics to Painting.—Origin of the Planetary System.—On Thought in Medicine.—Academic Freedom in German Universities.
"Professor Helmholtz's second series of 'Popular Lectures on Scientific Subjects' forms a volume of singular interest and value. He who anticipates a dry record of facts or a sequence of immature generalization will find himself happily mistaken. In style and method these discourses are models of excellence, and, since they come from a man whose learning and authority are beyond dispute, they may be accepted as presenting the conclusions of the best thought of the times in scientific fields."—Boston Traveler.