My dear Sir

I hope you will excuse me troubling you again, I have heard through a friend² from Ehrenberg, that he wants some earth from the Galapagos to hunt for Infusoria,³ & he suggests that perhaps a little may hang to the roots,—I fear not, but would you kindly look, & if you can shake any off, send it me.— Ehrenberg further is anxious for any earth or more especially peat from T. del. Fuego or the Falkland Islands.— I had specimens of peat, showing the process of its formation, by plants like Astelia &c &c, I do not know whether they were sent to you— I fear they are probably lost,—but I daresay a little peaty earth could be shaken off some of the little peat-loving plants of T. del. Fuego.—

I know you will not grudge some little trouble for so great a naturalist as Ehrenberg.

Pray believe me | Yours very sincerely | C. Darwin