My dear Lyell

I was glad to get your note & wanted to hear about your work—² I have been looking to see it advertised— it has been a long task— I had, before your return from Scotland, determined to come up & see you; but, as I had nothing else to do in town, my courage has gradually eased off, more especially as I have not been very well lately.— We get so many invitations here, that we are grown quite dissipated—but my stomach has stood it so ill, that we are going to have a month’s holidays & go nowhere. The subject, which I was most anxious to talk over with you, I have settled, by having written 60 pages of my S. American geology— I am in pretty good heart & am determined to have very little theory & only short descriptions.— The two first chapters, I think will be pretty good, on the elevation & great gravel terraces & plains of Patagonia & Chile & Peru.— I am astounded & grieved over d’Orbigny’s nonsense of sudden elevations; I must give you one of his cases.³

He finds still attached to the rocks at 300 ft, six species of truly littoral shells

He finds at 20 to 30 ft above sea, an immense accumulation of chiefly littoral shells.

He argues the whole 600 ft uplifted at one blow, because the attached shells at 300 ft have not been displaced.

Therefore when the sea formed a beach at 600 ft, the present littoral shells, were attached to rocks at 300 ft depth, & these same shells were accumulating by thousands, at 600 ft. depth.— Hear this oh Forbes:⁴ is it not monstrous for a professed conchologist?— This is a fair specimen of his reasoning. One of his arguments against the Pampas being a slow deposit, is that mammifers are very seldom washed by rivers into the sea!⁵ Because at 12,000 ft he finds the same kind of clay with that of the Pampas, he never doubts that it is contemporaneous with the Pampæan debacle, which accompanied the right Royal salute of every volcano in the Cordillera. What a pity these Frenchmen do not catch hold of a comet, & return to the good old geological dramas, of Burnett & Whiston—⁶ I shall keep out of controversy, & just give my own facts. It is enough to disgust one with Geology;—though I have been much pleased with the frank, decided, though courteous manner, with which d’orbigny disputes my conclusions, given unfortunately without facts & sometimes rashly in my Journal.⁷

Enough of S. America: I wish you w^d: ask M^r Horner (for I forgot to do so, & am unwilling to trouble him again) whether he thinks there is too much detail, (quite independently of the merit of the book) in my volcanic volume; as to know this, w^d. be of some real use to me; you could tell me, when we meet after York, when I will come to town: I had intended being at York, but my courage has failed; I sh^d much like to hear your lecture,⁸ but still more to read it; as I think reading is always better than hearing.

I am very glad you talk of a visit to us in the Autumn; if you can spare the time, I shall be truly glad to see M^rs. Lyell & yourself here; but I have scruples in asking anyone, for you know how dull we are here. Young Hooker talks of coming; I wish he might meet you— he appears to me a most engaging young-man.

I have been delighted with Prescott,⁹ of which I have read Vol I, at your recommendation; I have just been a good deal interested with W. Taylor of Norwich Life & correspondence.¹⁰

Farewell—with our kind remembrances to M^rs Lyell | Ever yours | C. Darwin

We had, until this morning when we heard, much hoped to have seen M^r & M^rs Horner here at Down.

On your return from York I shall expect a great supply of geological gossip: