Soc. Proc.' iii. 1842.), on
Earthquakes ('Geolog. Trans. v. 1840.), and on the Formation by
the Agency of Earth-worms of Mould. ('Geolog. Soc. Proc. ii.
1838.) I also continued to superintend the publication of the
'Zoology of the Voyage of the "Beagle".' Nor did I ever intermit
collecting facts bearing on the origin of species; and I could
sometimes do this when I could do nothing else from illness.
In the summer of 1842 I was stronger than I had been for some
time, and took a little tour by myself in North Wales, for the
sake of observing the effects of the old glaciers which formerly
filled all the larger valleys. I published a short account of
what I saw in the 'Philosophical Magazine.' ('Philosophical
Magazine,' 1842.) This excursion interested me greatly, and it
was the last time I was ever strong enough to climb mountains or
to take long walks such as are necessary for geological work.
During the early part of our life in London, I was strong enough
to go into general society, and saw a good deal of several
scientific men, and other more or less distinguished men. I will
give my impressions with respect to some of them, though I have
little to say worth saying.
I saw more of Lyell than of any other man, both before and after
my marriage. His mind was characterised, as it appeared to me,
by clearness, caution, sound judgment, and a good deal of
originality.
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