238 ON THE MOVEMENT OF SCEEE-MATEKIAL. 



vestigation a valuable one. It had often occurred to him that there 

 ■were more minute movements in loose materials than was generally 

 recognized, and that frequently a stratification was produced in 

 this way, as could frequently be seen in talus from excavations. 



Eev. Edwin Hill agreed that we were indebted to Mr. Darison. 

 He suggested that besides surface-motion an internal rearrangement 

 of the scree-stones was produced by such movements. 



The President called attention to observations by jS'ewbold upon 

 musical sand-hills, which showed that the sliding-down of the 

 sand whereby a musical note was produced was due to the sun's 

 heat. 



