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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.

"W^KrBEOOKS,

Associate In Biology, Johns Hopkins University.

Baltimore:
JOHN MURPHY & CO., Publishers.
1883.

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