Discusses foliation and cleavage. Comments on dip of cleavage laminae in mountains. Mentions views of Sedgwick and Studer. Suggests reading C. L. von Buch [Travels through Norway and Lapland (1813)] "as an amusement". Praises views of William Hopkins. Suggests reading paper by H. D. Rogers ["On cleavage of slate-strata", Edinburgh New Philos. J. 41 (1846): 422–3)]. Comments on the paper.

Supposes Sharpe does not want Von Buch’s tract, so sent Hopkins. Asks it be returned to CD at the Athenaeum Club.

Comments on letter by Bernhard Studer ["Remarks on the geological relations of the gneiss of the Alps", Edinburgh New Philos. J. 42 (1846–7): 186] and on article by DS ["On slaty cleavage", J. Geol. Soc. Lond. 3 (1847): 74–105]. Discusses geological cleavage and foliation.

Comments on manuscript [? "On slaty cleavage", J. Geol. Soc. Lond. 5 (1849): 111–29]. Discusses phenomenon of cleavage. Will write to J. D. Forbes about DS’s paper.

Thanks for note.

Glad DS sticks to cleavage and foliation question. Bernhard Studer one of few to take correct view on subject.

Thanks DS for writing about his research on foliation and cleavage. Discusses nature of slate and metamorphic schists.

Makes suggestions for the paper DS is preparing for the Royal Society and raises questions for his consideration; CD hopes he can attend the Society meeting when the paper is read ["On foliation and cleavage of Scotland", Philos. Trans. R. Soc. Lond. 142 (1852): 445–62].

Regrets he cannot come to hear DS’s paper ["On the structure of Mont Blanc", Q. J. Geol. Soc. Lond. 11 (1855): 11–27]. Has a lively interest in the subject.

Edward Forbes has misrepresented his view on foliation and cleavage [Athenæum 30 Sept 1854].

CD is convinced DS’s view will replace Huttonian and Lyellian view of metamorphic schists.

Recommends H. C. Sorby’s paper [probably "On the origin of slaty cleavage", Edinburgh New Philos. J. 55 (1853): 137–50].