X CONTENTS. 



PAGE 



ON CELESTIAL DYNAMICS, BY J. R. MAYER, . . 259 



I. Introduction, ..... 269 



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 



VH. The Tidal Wave, 291 



VIII. 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, . . . . . .387 



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 



