32 



ART. 6.— S. KUSAKABE 



that for soft iron. Corrections due to some differences between their 

 respective dimensions are not taken into account. The horizontal 

 line corresponds to a rigid substance, Avhile the vertical, to an ideal 

 fluid. Numerical values of the modulus of rigidity for different rocks 

 are also added in the annexed table. They serve, however, only to 

 indicate their order of magnitude. 



Table III. 



No. 



Rock 



Locality 



Kind 



Mod. of 

 Rigidity 



Density 



Velocity of 

 Trans. W. 



