X CONTENTS. 



I AGB 



ON CELESTIAL DYNAMICS, BY DR. J. B. MAYER, . . 259 

 I. Introduction, ..... 259 



II. Sources of Heat, . . . . . . 261 



III. Measure of the Sun s Heat, . . . .264 



IY._Origin of the Sun s Heat, . . . 276 



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



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



VIL The Tidal Wave, . . . .291 



VIH. 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 



