

CONTENTS. IX 



PAGE 



The law of the laboratory will account for the movements of 

 the satellites .* ''.' ' i, . >'' V- ; 122 



The law of the laboratory will account for the movements of 

 the sun . , " . -. "'.- 122 



The " attraction of currents " is the real force of gravity "T.. 123 



Hence, the movements of the heavenly bodies are due, one and 

 all, to the law of the laboratory . . . ... t , . . 124 



CHAP. III. 



SEAECH AFTEB A CENTEAL LAW IN SOME OP THE PHENOMENA OF 

 NATUEAL HEAT. 



The importance of heat in the economy of nature . . , 125 



The amount of solar heat communicated to the earth . . 126 

 Probable effects of this heat . 126 



This heat will cause the earth to expand on the side next the 

 sun . 129 



This heat will be brought to a focus within the earth . . 131 

 The objections to this view may be set aside . . . .132 

 The heat may travel through the earth with extreme rapidity . 134 



This focal concentration of heat will cause fusion and expan- 

 sion of the parts corresponding to the focus . . . 136 



