LAW OF HEREDITY.

A STUDY OP THE

CAUSE OF V ABLATIO!^

AND THE

Origin Of Living Organisms.

W. K. gROOKS,

Associate Is Biology, Johns Hopkins Ukiversiti.

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

TO

^ >

The Memory Of
OHAELES DAEWIN,

FROM WHOSE STOKE OF PUBLISHED FACTS I HAVE
DRAWN MOST OF THE MATERIAL FOR THIS
VOLUME.