Long before this it existed as a slate and porphyritic line of hills.

I have collected a tolerable quantity of information respecting the period and forms of elevations of these plains.

I think these will be interesting to Mr.Lyell; I had deferred reading his third volume till my return: you may guess how much pleasure it gave me; some of his woodcuts came so exactly into play that I have only to refer to them instead of redrawing similar ones.

I had my barometer with me, I only wish I had used it more in these plains.

The valley of S.Cruz appears to me a very curious one; at first it quite baffled me.