The Cambridge Manuals of Science and Literature
THE NATURAL HISTORY OF CLAY
FETTER LANE, E.C.C. F. CLAY, Manager
100, PRINCES STREET
WILLIAM WESLEY AND SON, 28, ESSEX STREET, STRAND
A. ASHER AND CO.
F. A. BROCKHAUS
G. P. PUTNAM'S SONS
MACMILLAN AND CO., Ltd.All rights reserved
THE NATURAL
HISTORY OF CLAY
BY
ALFRED B. SEARLE
Cantor Lecturer on Brickmaking,
Author of British Clays, Shales
and Sands; The Clayworker's
Handbook, etc., etc.
Cambridge:
at the University Press
New York:
G. P. Putnam's Sons
1912
PRINTED BY JOHN CLAY, M.A.
AT THE UNIVERSITY PRESS
With the exception of the coat of arms atthe foot, the design on the title page is areproduction of one used by the earliest knownCambridge printer, John Siberch, 1521
Both as raw materials and in the form of pottery,bricks, tiles, terra-cotta and many other articlesof use and ornament, clays are amongst the mostimportant rock products. Yet the origin of thesubstances we know as 'clay,' the processes occurringin its formation and the causes of some of the mostimportant of its characteristics are of