308 LIGHT SCIENCE FOR LEISURE HOURS. 



centres of gravity lie considerably within 400 feet of C, 

 and C' lies considerably within 825 feet of C. Thus 

 the centres of figure and the centres of gravity of the 

 earth's solid mass, and of the entire fluid and solid mass 

 are collected within a space less than one-eighth of 

 mile in length a distance almost evanescent in com- 

 parison with the dimensions of the earth's globe, 



LONDON : PRINTED BY 



SPOTTISWOODE AND CO., NEW-STREET SQUARE 

 AND PARLIAMENT STREET 



