Errata in Geological Magazine, June, 1871, p. 267, lines 43 et sequi, for “but in the granitic-felstone the rock is often thin, very fine or coarse,” etc., etc, read “but in the granitic-felstone the rock is often in thin, very fine, or coarse bands, striping the rock, like ribbon, they differing, etc., etc.”—At p. 247, line 20 from foot, for “; their,” read “. The”.