RECORD: Darwin, C. R. I may also remark that generally where the cleavage of the Mica Slates is not well developed. CUL-DAR42.77 Transcribed by John van Wyhe (Darwin Online,

REVISION HISTORY: Transcribed by John van Wyhe, corrections by Kees Rookmaaker 5.2011. RN1

NOTE: Editorial symbols used in the transcription:
[some text] 'some text' is an editorial insertion
[some text] 'some text' is the conjectured reading of an ambiguous word or passage
[some text] 'some text' is a description of a word or passage that cannot be transcribed
< > word(s) destroyed
<some text> 'some text' is a description of a destroyed word or passage
Text in small red font is a hyperlink or notes added by the editors.

Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin.


[top of page excised]

I may also remark, that generally where the cleavage of the Mica Slates is not well developed, the angle is small. —

Tres Montes [twisted] where dykes

77 verso

[top of page excised]

(b) Perhaps in several cases the presence of <remainder excised>

to be parallel) in these Slates has determine the lines of dyke. — But we <remainder excised>

of up burst must have been more E & W than N & S. — In one case the mechanical yielding of the laminae, has determined it. —

This document has been accessed 2486 times

Return to homepage

Citation: John van Wyhe, editor. 2002-. The Complete Work of Charles Darwin Online. (

File last updated 2 July, 2012