268 C. H. SMYTH, JR.—WEATHERING OF ALNOITE. 
a 
presented by Merrill * to prove the rapidity of weathering in cooler cli- 
mates. It also tends to accentuate the fact that the nature of the rock 
is the most important element in determining the rate of weathering, 
although the precise character of the process may be largely influenced 
by climate. 
Bull. Geol. Soe. Am., vol. vii, pp. 359-361. 
