1918—19.] 
The Propagation of Earthquake Waves. 
189 
I. Condensational wave incident 
in elastic solid. 
II. Distortional wave incident in 
elastic solid. 
III. Condensational wave incident 
in elastic non-rigid sub- 
stance. 
A, A l5 A' are the condensational 
energies. 
B, B t , B' are the distortional 
energies. 
Fig. 8. 
