At the extremity of my sketch, fig. 1, p. 52, which by the printer's inadvertence is marked Y instead of X, the beds appear to turn suddenly downwards. They are actually more inclined at this spot; but the principle cause of their apparent increase in steepness is a change in their strike. Generally parallel to the precipice, it here turns westwards (i.e. towards the spectator); and, holding myself bound in candour to note, as I proceed, every circumstance appearing to make for the modern glacial theories, I must admit that, as the beds at this extremity of the cliff turn outwards from the Alps, it might not inaptly be concluded that the great Chamouni Glacier, which by its friction filed the mountain two thousand feet down at the top, by its pressure turned the end of it several points of the compass round at the bottom!