by Prof. Grove, Prof. Helmholtz, Dr. Mayer, Dr. Faraday, Prof. Liebig and Dr. Carpenter ; with an introduction and brief biographical notices of the chief promoters of the new views, by Edward L. Youmans
Micro-opaque. New York : Readex Microprint, 1973. 6 cards ; 23 x 15 cm. (Landmarks of science)
The correlation of physical forces / by W. R. Grove -- On the interaction of natural forces / by H. L. F. Helmholtz -- Remarks on the forces of inorganic nature / by J. R. Mayer -- On celestial dynamics / by J. R. Mayer -- Remarks on the mechanical equivalent of heat / by J. R. Mayer -- Some thoughts on the conservation of force, by Dr. Faraday -- On the connection and equivalence of forces / by J. von Liebig -- On the correlation of physical and vital forces, by W. B. Carpenter