" GO ON AND PROSPER ; THERE IS NOTHING SO 

 USEFUL IN SCIENCE AS ONE OF THOSE EARTH- 

 QUAKE HYPOTHESES, WHICH OBLIGE ONE TO FACE 

 THE POSSIBILITY THAT THE SOLIDEST-LOOKING 

 STRUCTURES MAY COLLAPSE." 



Letter from Prof. Huxley to 

 the Author. June 2, 1889. 



