In May and June he was at Shrewsbury and Maer, whence he went on to make the little tour in Wales, of which he spoke in his 'Recollections,' and of which the results were published as "Notes on the effects produced by the ancient glaciers of Caernarvonshire, and on the Boulders transported by floating Ice." ('Philosophical Magazine,' 1842, page 352.)
Mr. Archibald Geikie speaks of this paper as standing "almost at the top of the long list of English contributions to the history of the Ice Age." (Charles Darwin, 'Nature' Series, page 23.)
The latter part of this year belongs to the period including the settlement at Down, and is therefore dealt with in another chapter.]
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