The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. n.d. St Jago / In some sections I imagined that the lower part of the stream appeared more vesicular than the upper. CUL-DAR40.59. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2021. RN1

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.

[59]

St Jago

* In some sections I imagined that the lower part of the stream appeared more vesicular than the upper which is contrary to what might have been expected, since the lower parts have been subjected to a greater pressures. [insertion:] suppose it may be accounted for. If this fact be gradual; is the fact due to the tendency which the bubbles (as well as the vapour generated by the lava passing over the bottom of the sea) would exert to rise upwards into the mass of lava, whereas on the upper surface they would tend to escape into superincumbent water or atmosphere?

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