CONTENTS. 



ON CELESTIAL DYNAMICS, BY J. R. MAYER, . . 269 



I. Introduction, . . . . .259 



II. Sources of Heat, .... 261 



HI. Measure of the Sun's Heat, . . . .264 



IV. Origin of the Sun's Heat, . . 276 



V. Constancy of the Sun's Mass, . . .282 



VI. The Spots on the Sun's Disc, . . .286 



Vn. The Tidal Wave, . . . . .291 



Vm. The Earth's Interior Heat, ... 300 



REMARKS ON THE MECHANICAL EQUIVALENT OF HEAT, By 



DR. J. R. MAYER, 316 



SOME THOUGHTS ON THE CONSERVATION OF FORCE, BY Dr. 



FARADAY, ...... 359 



THE CONNECTION AND EQUIVALENCE OF FORCES, BY PROF. 



LIEBIG, ...... 887 



ON THE CORRELATION OF THE PHYSICAL AND VITAL 



FORCES, BY DR. CARPENTER, . . .401 



I. Relation of Light and Heat to the Vital Forces of Plants, 401 

 II. Relation of Light and Heat to the Vital Forces of Ani- 

 mals, . . 420 



