Letter 521.), the water would flow from it and the second shelf would be
formed. This supposes that a vast barrier of ice still remains under Ben
Nevis, along all the lower part of the Spean. Lastly, I suppose the ice
disappeared everywhere along L. Loggan, L. Treig, and Glen Spean, except
close under Ben Nevis, where it still formed a barrier, the water flowing
out at level of lowest shelf by the Pass of Mukkul at head of L. Loggan.
This seems to me to account for everything. It presupposes that the
shelves were formed towards the close of the Glacial period. I come up to
London to read on Thursday a short paper at the Linnean Society. Shall I
call on Friday morning at 9.30 and sit half an hour with you? Pray have no
scruple to send a line to Queen Anne Street to say "No" if it will take
anything out of you. If I do not hear, I will come.


LETTER 531. TO J. PRESTWICH.
Down, January 3rd, 1880.

You are perfectly right. (531/1. Prof. Prestwich's paper on Glen Roy was
published in the "Phil. Trans. R. Soc." for 1879, page 663.) As soon as I
read Mr. Jamieson's article on the parallel roads, I gave up the ghost with
more sighs and groans than on almost any other occasion in my life.



2.IX.IV. CORAL REEFS, FOSSIL AND RECENT, 1841-1881.


LETTER 532. TO C. LYELL.
Shrewsbury, Tuesday, 6th [July, 1841].