90 G. F. BECKER — FINITE STRAIN IX ROCKS. 



to external and bodily forces much like a mass of lard of the same 

 dimensions* 



* I desire to express my thanks to Professor R. S. Woodward, of the i oast and Geodetic Survey, 

 for his kindness in reading this paper in manuscript and for giving me the benefit of his advice. 

 This is not. the first time I have had the advantage of Professor Woodward's profound knowledge 

 of physics and keen scientific judgment. 



Washington, D. C, July 1, ISO.'. 



