I do not mean that the limestone changed to granite, but that the granite had risen up out of the bottom of the valley, and had carried the limestone (I suppose) up on its back hundreds of feet into the air.

Those caves with the waterfalls pouring from their mouths were all on one level, at the top of the granite, and the bottom of the limestone.

That was to be expected; for, as I will explain to you some day, water can make caves easily in limestone: but never, I think, in granite.

But I knew that besides these cold springs which came out of the caves, there were hot springs also, full of curious chemical salts, just below the very house where I was in.

And when I went to look at them, I found that they came out of the rock just where the limestone and the granite joined.