﻿Vol. 6 1.] AN EXPERIMENT IN MOUNTAIN-BUILDING. 357 



the casts ' too closely ' resembled Nature. He observed that when 

 the surface on which rain, etc. had to act was so irregular as 

 in the casts exhibited, the result would mainly be to deepen the 

 original valleys. There would be, as the models showed, at first 

 some lakes, which would be drained by more or less deep and 

 narrow gorges. 



In reply to Mr. Whitaker, he said that there was a thickness 

 of 3 or 4 inches of sand overlying the top layer of cloth. The 

 actual materials used showed such hollows as those suggested by 

 Prof. Garwood, and into these sand had been forced up, but the 

 hollows could not, of course, be reproduced in the casts. 



UJ.G.8. No. 242. 2 c 



