Vlll CONTENTS 



NOTE PAGE 



IV THE LIGHT FORCE AT A REFRACTING 



SURFACE 87 



V THE PRESSURE OF SUNLIGHT AGAINST AN 

 ABSORBING SPHERE COMPARED WITH THE 

 GRAVITATION PULL 90 



VI THE AMOUNT OF MATTER WHICH CAN BE 

 PUSHED OUT BY THE PRESSURE OF 

 SUNLIGHT . . . . . .92 



VII THE RESISTING FORCE ON A SPHERE 

 MOVING ROUND THE SUN AND RADIATING 

 R PER SQ. CM. PER SECOND, AND THE 

 REDUCTION OF ITS ORBIT ROUND THE 

 SUN ........ 95 



