To Bernhard Studer 20 January 
Down Farnborough | Kent
I have been so much interested by a letter of yours, in the last Edinburgh New Philosoph. Joournal,1 on the laminæ in gneiss not having been formed as planes of deposition, that I have taken the liberty to send you a copy of my Geolog. Observ. on S. America, published last autumn on account of a discussion on this subject. If you read English I hope you will take the trouble to read from p. 162 to 168, in which I have endeavoured to show that the lamination (denominated by me foliation after a suggestion of Prof. Sedgwick)2 of the metamorphic schists is a closely allied phenomenon with cleavage.
With many apologies for my presumption in thus addressing you, I beg to remain with much respect | Your faithful & obedt. sert | Charles Darwin
Much interested in BS’s letter on gneiss ["Remarks on the geological relations of the gneiss of the Alps", Edinburgh New Philos. J. 42 (1847): 186–7].
Sends copy of South America.
Has shown that lamination of metamorphic schists closely allied with cleavage.
Please cite as
Darwin Correspondence Project, “Letter no. 1054,” accessed on 3 December 2016, http://www.darwinproject.ac.uk/DCP-LETT-1054