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MALE AND FEMALE WOOD DUCK, TO SHOW SECONDARY SEXUAL CHARACTERS.
[From photographs of stuffed specimens in the Collection of the Maryland Academy of Sciences.]
THE
LAW OF HEREDITY.
A STUDY OF THE
CAUSE OF VARIATION,
AND THE
ORIGIN OF LIVING ORGANISMS.
BY
W. K. BROOKS,
ASSOCIATE IN BIOLOGY, JOHNS HOPKINS UNIVERSITY.
BALTIMORE:
JOHN MURPHY & CO., PUBLISHERS. 1883.