OBITUARY NOTICES. 6l
top. This greatly reduces the noise which would otherwise be made by the
engine when at work. Flint he found to be the only shingle which could
withstand the influences to which it was exposed for any length of time, lime-
stone being destroyed with remarkable rapidity. In one case at Oxford,
where the shingle largely consisted of limestone, he states that, after the
chamber had been in use only three days, "I found over two tons had almost
disappeared, as a fine powder, and had been deposited over the adjacent
roofs. The chamber was refilled with good flint shingle, and has not been
touched for about three years." He adds that flint ultimately becomes
reduced to mud, not sand. The geological bearing and interest of experiences
of this kind scarcely need pointing out.
The late Mr. T. H. Wilson.
Mr. Wilson began to reside at Chingford shortly before he joined the
Essex Field Club in 1886, and continued to live there till between two and
three years ago. He always took a keen interest in the work of the Club,
and, when he died, had been for some years a member of its Council.
Though his business engagements occupied most of his time, he was a
diligent student of the geology and archaeology of Essex, more especially of
that portion of the county within or on the borders of Epping Forest, to
which he was strongly attached. He contributed many useful geological and
other notes on this district to the pages to the Essex Naturalist, and the
present writer has been greatly indebted to him from time to time for informa-
tion as to the opening of new geological sections there or the re-development