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FEMALE.

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

LA"W OF HEREDITY.

A STUDY OF THE

CAUSE OF VAEIATIOW,

AUD THE

Origin Of Living Organisms.

s: . Bt-

W. K. BKOOKS,

Associate Is Biology, Johns Hopkins University.

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

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