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, 



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