My dear Hooker

Thank you for telling me about the books,¹ I have written to know their price, & shall order Miquel if not too dear: the other seems a large Flora.—

You well know how credulous I am, & therefore you will not be surprised at my believing the Raspberry story:² a very similar case is on record in Germany viz seeds from a Barrow: I have hardly zeal to translate it for Gardeners’ Chronicle.³ I do not go whole hog, viz that 60 & 2000 years are all the same, for I sh^d. imagine that some slight chemical change was always going on in a seed. Is this not so?— The discussions have stirred me up to send my very small case of the charlock; but as it required some space to give all details, perhaps Lindley will not insert; & if he does, you, you worse than an unbelieving Dog, will not, I know, believe.⁴ The reason I do not care to try M^r. Bentham’s plan is that I think it would be very troublesome, & it would not, if I did not find seed, convince me myself that none were in the earth,⁵ for I have found in my salting experiments that the earth clings to the seeds & the seeds are very difficult to find. Whether washing would do I know not; a gold-washer would succeed I daresay.—

I have become extremely much interested on my old puzzle about Social Plants: Decandolle by the facts, which he gives makes the case only the more puzzling in my eyes.⁶ The case of social plants is of no direct importance whatever to me, but indirectly it is, as I particularly want to understand as much as I can of what has been called the economy of nature. There is one small class of facts, not alluded to, by Decandolle, which I think would throw more light on sociability than any other; namely whether introduced plants are ever social in their new country not being so in their old; for should such be the case, then, I think, we might safely (at least in that instances) attribute sociability to the nature of the conditions & surroundings species, & not to anything inherent in the social species itself. Would M^r Bentham be so kind as not to think it very troublesome to reflect whether he knows any case? it requires knowledge of the species in the old & new country. In La Plata the cardoon & sort of Sow Thistle are wonderfully social, are they in their parent country?⁷ The Fennel I think deserves, also, to be considered such near Monte Video: is this so in Europe? If I can trust my memory the Guava tree was so in Otaheite.—⁸ The accounts of the beds of the Impatiens in Surrey sound as if this was “social”: how is it in America?— Is the Sweet Briar social in Tasmania. Do you not think that these cases would throw light on “sociability”? But why on earth are not Tropical plants social?⁹ How comes it that some plants near their extreme limits are social?¹⁰ What puzzles there are in all such cases!

I have written much longer than I intended; but remember that I never have pleasure of talking over these subjects.— Oh that I was a Botanist is my daily almost hourly groan.—

Adios | C. Darwin

I was very glad to hear in your penultimate note that the poor Baby was better: it must be a great relief to M^rs. Hooker.—

Wollaston has returned from Madeira with nearly 11,000 insects!¹¹