ERRATA. Page 82, line 6 from bottom should read—“ subjected to vertical pressure tends to split along a plane F inclined ” ,, 159, line 15—for “Mingage” read “ Mingaye” ,, 175, line 20, and page 177, line 13—for “ Corinthia ” read “ Carinthia ’ ,, 576, line 21—-for £ £ Chontupazat ” read “Choukpazat” ,, 598, line 21—for “Reman Legeh,” read “Reman, Legeh, ’ ,, 828, line 11 from bottom—for “Mine Le Motte” read “Mine La Motte ”