The termination of the voyage has been decided – September 1836.
The earthquake of Concepción.
His geological observations (since November). Can now prove both sides of the Andes have recently risen to considerable heights.
Plans to cross the Cordilleras.
My dear Henslow
We now are lying becalmed off Valparaiso & I will take the opportunity of
writing a few lines to you. The termination of our voyage is at last decided
on—we leave the coast of America in the beginning of September & hope
to reach England in the same month of 1836. I am heartily glad of it, nothing should
induce me to stay out any longer. As it is, it will be nearly as long as a seven years
transportation. But now that I do clearly see England in the distance, I care for
nothing, not even sea sickness. In October perhaps I shall be in Cambridge & who
knows but taking a walk with you round by Shelford common.— You can hardly
understand how I long to see you & all my friends again; & now there
only wants a year & half to that time. We shall see a great many places in this
interval, but I am afraid there will be but few opportunities for much Natural History.
We are now making a passage from Concepcion.— You will have heard an account
of the dreadful earthquake of the 20
Since leaving Valparaiso, during this cruize, I have done little excepting in Geology.— In the modern Tertiary strata I have examined 4 bands of disturbance, which reminded me on a small scale of the famous tract in the Isle of Wight.— In one spot there were beautiful examples of 3 different forms of upheaval.— In two cases I think I can show, that the inclination is owing to the presence of a system of parallel dykes traversing the inferior Mica Slate. The whole of the coast from Chiloe to S. extreme of the Pen: of Tres Montes is composed of the latter rock; it is traversed by very numerous dykes, the mineralogical nature of which will I suspect turn out very curious. I examined one grand transverse chain of Granite, which has clearly burst up through the overlying Slate. At P. Tres Montes there has been an old Volcanic focus, which corresponds to another in the North part of Chiloe. I was much pleased at Chiloe by finding a thick bed of recent oysters shells, &c, capping the Tertiary plain, out of which grew large forest trees.— I can now prove that both sides of the Andes have risen in the recent period to a considerable height.— Here the shells were 350 ft above the sea.—
In Zoology I have done but very little; excepting a large collection of minute Diptera & Hymenoptera from Chiloe. I took in one day, Pselaphus, Anaspis, Latridius Leiodes, Cercyon, & Elmis & two beautiful true Carabi, I might almost have fancied myself collecting in England. A new & pretty genus of Nudibranch Mollusc: which cannot crawl on a flat surface: & a genus in the family of Balanidæ, which has not a true case, but lives in minute cavities in the shells of the Concholepas, are nearly the only two novelties. You were surprised at hearing of land Planariæ; you will equally be so, when you see leaches, which live entirely out of water in the fore<sts> of Chiloe & Valdivia.— Before the Beagle sails for Lima, I shall be obliged to send away one more box: this will be the last; with which I shall trouble you. I am afraid so many boxes must have been very much in your way. I trust they may turn out worth their stowage. I will write again, when this last Cargo is sent. You ought to have received about a month since 2 boxes by H.M.S. Challenger & before that 2 Casks & one jar by H.M.S. Samarang.— Will you write to me directed to Sydney, not long after receiving this letter.— I am very unreasonable in begging for so many letters; but bear with me for one year more.— If any come directed in the mean time to S. America, they will be forwarded to Sydney by the Admiral.—
Valparaiso March 13
So my dear Henslow, good night | Your Most obliged & affectionate friend | Chas. Darwin.
- f1 272.f1The following passages from this letter were extracted by Henslow and published in the Cambridge Philosophical Society pamphlet:
1.1 `We now … 1836.' 1.4 1.12 `You … novelties.' 3.7; 3.7 `Concholepas' transcribed incorrectly as `concholapas'
- f2 272.f2See South America, p. 124, for CD's description of the strata of the peninsula of Lacuy, Chiloé. The Isle of Wight formation is described in Conybeare and Phillips 1822, pp. 108--9, which CD had on board the Beagle. An unannotated copy is in Darwin Library--Down.
- f3 272.f3The description of this specimen (Cryptophialus minutus) later led CD to his eight-year labour of Cirripedia classification. `I had originally intended to have described only a single abnormal Cirripede, from the shores of South America, and was led, for the sake of comparison, to examine the internal parts of as many genera as I could procure' (Living Cirripedia 1: v; see also Autobiography, p. 117). The description is in Living Cirripedia 2: 566.