If the reader will send his name and address, the publishers will send, from time to time, information regarding their new books.

HENRY HOLT AND COMPANY
PUBLISHERS NEW YORK

American Science Series

The two principal objects of the series are to supply authoritative books whose principles are, so far as practicable, illustrated by American facts, and also to supply the lack that the advance of science perennially creates, of text-books which at least do not contradict the latest generalizations.

Physics.

By A.L. Kimball, Professor in Amherst College. (In preparation.)

Physics.

By George F. Barker, x + 902 pp. $3.50.

Chemistry.

By Ira Remsen, President of the Johns Hopkins University.