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BY THE SAME AUTHOR.
STUDIES IN GENERAL
SCIENCE.....175 “The writer evinces admirable gifts both as a student and a thinker. She brings a sincere and earnest mind to the investigation of truth.”—N, Y. Tribune.
THE SEXES THROUGH
OUT NATURE ... 1 25
“A most valuable contribution to the literature of the subject.”— Boston Globe.
Published by G. P. Putnam's Sons,