Explains how melting of ice in Glen Spean could have successively freed two lower cols, thus establishing the water-levels that determined the two lower shelves in Glen Roy.
Plans to read a paper to the Linnean Society ["Sexual forms of Catasetum", Collected papers 2: 63–70].
My dear Lyell.
I am not quite sure that I understand your difficulty, so I must give what
seems to me the explanation of the glacial-lake-theory at some little
length. You know that there is a rocky outlet at the level
of all the shelves.— Please look at my map:
I suppose whole valley of Glen Spean filled with ice; then water would escape from
outlet at Loch Spey & the highest shelf would be
first formed. Secondly ice began to retreat, &
water would flow for short time over its surface; but as soon as it retreated from
behind hill marked Craig Dhu, where the outlet on level of 2
I come up to London to read on Thursday short paper at Linn. Soc.
Yours affect | C. Darwin
- f1 3491.f1The year is established by the reference to CD's reading a paper at the Linnean Society (see n. 5, below).
- f2 3491.f2See letter from Charles Lyell, [26--31 March 1862].
- f3 3491.f3CD refers to the map accompanying his paper, `Parallel roads of Glen Roy'.
- f4 3491.f4Milne 1849, p. 398.
- f5 3491.f5CD read his paper, `Three sexual forms of Catasetum tridentatum', before the Linnean Society of London on 3 April 1862 (Journal of the Proceedings of the Linnean Society of London (Botany) 6: lxiv). According to Emma Darwin's diary (DAR 242), CD left for London on Wednesday 2 April and returned home on Friday 4 April 1862.
- f6 3491.f6CD's brother Erasmus Alvey Darwin lived at 6 Queen Anne Street, London.