As I had at first come up to Cambridge at Christmas, I was forced
to keep two terms after passing my final examination, at the
commencement of 1831; and Henslow then persuaded me to begin the
study of geology. Therefore on my return to Shropshire I
examined sections, and coloured a map of parts round Shrewsbury.
Professor Sedgwick intended to visit North Wales in the beginning
of August to pursue his famous geological investigations amongst
the older rocks, and Henslow asked him to allow me to accompany
him. (In connection with this tour my father used to tell a
story about Sedgwick: they had started from their inn one
morning, and had walked a mile or two, when Sedgwick suddenly
stopped, and vowed that he would return, being certain "that
damned scoundrel" (the waiter) had not given the chambermaid the
sixpence intrusted to him for the purpose. He was ultimately
persuaded to give up the project, seeing that there was no reason
for suspecting the waiter of especial perfidy.--F.D.)
Accordingly he came and slept at my father's house.

A short conversation with him during this evening produced a
strong impression on my mind. Whilst examining an old gravel-pit
near Shrewsbury, a labourer told me that he had found in it a
large worn tropical Volute shell, such as may be seen on the
chimney-pieces of cottages; and as he would not sell the shell, I
was convinced that he had really found it in the pit. I told
Sedgwick of the fact, and he at once said (no doubt truly) that
it must have been thrown away by some one into the pit; but then
added, if really embedded there it would be the greatest
misfortune to geology, as it would overthrow all that we know
about the superficial deposits of the Midland Counties. These