625 pages, and Index. Cloth,
$5.00.

"Not a novel in all the list of this year's publications has in it any
pages of more thrilling interest than can be found in this book by
Professor Wright. There is nothing pedantic in the narrative, and the
most serious themes and startling discoveries are treated with such
charming naturalness and simplicity that boys and girls, as well as
their seniors, will be attracted to the story, and find it difficult to
lay it aside."--_New York Journal of Commerce_.

"One of the most absorbing and interesting of all the recent issues in
the department of popular science."--_Chicago Herald_.

"Though his subject is a very deep one, his style is so very unaffected
and perspicuous that even the unscientific reader can peruse it with
intelligence and profit. In reading such a book we are led almost to
wonder that so much that is scientific can be put in language so
comparatively simple."--_New York Observer_.

"The author has seen with his own eyes the most important phenomena of
the Ice age on this continent from Maine to Alaska. In the work itself,
elementary description is combined with a broad, scientific, and
philosophic method, without abandoning for a moment the purely
scientific character. Professor Wright has contrived to give the whole a
philosophical direction which lends interest and inspiration to it, and
which in the chapters on Man and the Glacial Period rises to something
like dramatic intensity."--_The Independent_.

"... To the great advance that has been made in late years in the
accuracy and cheapness of processes of photographic reproduction is due
a further signal advantage that Dr. Wright's work possesses over his
predecessors'. He has thus been able to illustrate most of the natural
phenomena to which he refers by views taken in the field, many of which
have been generously loaned by the United States Geological Survey, in
some cases from unpublished material; and he has admirably supplemented
them by numerous maps and diagrams."--_The Nation_.

_MAN AND THE GLACIAL PERIOD_. By G. FREDERICK WRIGHT, D. D., LL. D.,
author of "The Ice Age in North America," "Logic of Christian
Evidences," etc. International Scientific Series. With numerous
Illustrations. 12mo. Cloth, $1.75.

"It may be described in a word as the best summary of scientific
conclusions concerning the question of man's antiquity as affected by
his known relations to geological time."--_Philadelphia Pr