A PORTRAYAL OF THE SPIRIT AND METHODS OF SCIENCE.

By DR. ERNST MACH.

PROFESSOR OF THE HISTORY AND THEORY OF INDUCTIVE SCIENCE IN THE UNIVERSITY OF VIENNA.

Translated by THOMAS J. McCORMACK.

Third Edition, Revised Throughout and Greatly Enlarged.

Cloth, Gilt Top. Exhaustively Indexed. Pages, 415. Cuts, 59. Price, $1.50.

TITLES OF THE LECTURES.

• The Forms of Liquids.
• The Fibres of Corti.
• On the Causes of Harmony.
• On the Velocity of Light.
• Why Has Man Two Eyes?
• On Symmetry.
• On the Fundamental Concepts of Static Electricity.
• On the Principle of the Conservation of Energy.
• On the Economical Nature of Physical Inquiry.
• On the Principle of Comparison in Physics.
• On the Part Played by Accident in Invention and Discovery.
• On Sensations of Orientation.
• On the Relative Educational Value of the Classics and the Mathematico-Physical Sciences.
• A Contribution to the History of Acoustics.
• Remarks on the Theory of Spatial Vision.
• On Transformation and Adaptation in Scientific Thought.