D. APPLETON & C0,’8 PUBLICATIONS, 
Professor E. L. YOUMANS’S WORKS. 
CLASS-BOOK OF CHEMISTRY. New edition. 12mo, 
Cloth, $1.50. 
THE HAND-BOOK OF HOUSEHOLD SCIENCE. A 
Popular Account of Heat, Light, Air, Aliment, and Cleansing, in 
their Scientific Principles and Domestic Applications. 12mo. Iilus- 
trated. Cloth, $1.75. 
THE CULTURE DEMANDED BY MODERN LIFE. 
‘A Series of Addresses and Arguments on the Claims of Scientific 
Education. Edited, with an Introduction on Mental Discipline in 
Education. 1 vol.,12mo. Cloth, $2.00. 
CORRELATION AND CONSERVATION OF FORCES. 
A Scries of Expositions by Scientific Men. Edited, with an Intro- 
duction and Brief Biographical Notices of the Chief Promoters of 
the New Views, by Epwarp L. Youmans, M.D. 12mo. Cloth, 
$2.00. 
CONTENTS. 
I. By Professor W. R. Grove. The Correlation of Physical Forces. 
Il. By Professor Hetmnoirz. The Interaction of Natural Forces. 
Ill. By Dr. J.R. Mayer. 1. Remarks on the Forces of Inorganic Nature. 
2. On Celestial Dynamics. 
3. On the Mechanical Equivalent of Heat. 
IV. By Dr. Farapay. Some Thoughts on the Conservation of Forces. 
V. By Professor Lirsre. The Connection and Equivalence of Forces. 
VI. By Dr. Carrenter. The Correlation of the Physical and Vital 
Forces. 
“ This work is a very welcome addition to our scientific literature, and 
will be particularly acceptable to those who wish to obtain a popular but 
at the same time precise and clear view of what Faraday justly calls the 
highest law in physical science, the principle of the conservation of foree. 
Sufficient attention has not been paid to the publication of collected mono- 
graphs or memoirs upon special subjects. r. Youmans’s work exhibits 
the value of such collections in a verv striking manner, and we earnestly 
hope his excellent example may be followed in other branches of science.”’ 
American Journal of Science. 
New York: D. APPLETON & CO., 1,3, & 5 Bond Street. 
