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 23 April 2017, http://www.darwinproject.ac.uk/DCP-LETT-1054