I presume the cause of the cramp was the great change in the kind of muscular action, from that of hard riding to that of still harder climbing.

It is a lesson worth remembering, as in some cases it might cause much difficulty.
I have already said the mountain is composed of white quartz rock, and with it a little glossy clay-slate is associated.

At the height of a few hundred feet above the plain, patches of conglomerate adhered in several places to the solid rock.

They resembled in hardness, and in the nature of the cement, the masses which may be seen daily forming on some coasts.

I do not doubt these pebbles were in a similar manner aggregated, at a period when the great calcareous formation was depositing beneath the surrounding sea.