The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. [1834-1846]. Horizontal section [on Chiloe]. CUL-DAR39.195. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. Corrected by John van Wyhe 2024. RN3

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.

This is a fair copy of the sketch on the Port Desire notebook, pp. 116-117 of an area around Castro on Chiloe on paper watermarked 1828. Later made into figure No. 20 in South America, p. 124 "No. 20. ─ Ground-plan showing the relation between veins and concretionary zones in a mass of tuff." The "16" is a reference to Darwin's page 16 in his Chilooe notes in CUL-DAR35.310.

[195]

(16)

Horizontal section: ~~length 3 or 4 feet x 2: drawn in proportion after nature~~

The double lines represent sides of fissures: & these are slightly prominent.

The curvilinear dotted lines, are not nearly in sufficient numbers, they show the figure of the arrangement of the coarser & finer particles in the sandstone

Fig. β.—

/over

/over] pencil. Sketch and caption in black ink. Corrections in brown ink.

[195v]

Showing the relation between veins & concretionary action in between beds of Chiloe; dark line paps & very marbled lines represent unusually zones of concretionary action

Must be reduced.─ the double generally straight lines represent fissures or veins ─ The circles & curves represent concretionary zones of different textures & colours ─ ought they not to be done with dotted lines ─ slight irregularities in my drawing must be corrected.

Showing the relation...concretionary action] pencil.

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)