Every step in the progress of this study has tended to obliterate the technical barriers by which logicians have sought to separate the inquiries relating to the several parts of man's nature.

Analogue. A part or organ in one animal which has the same function as another part or organ in a different animal.

Homologue. The same organ in different animals under every variety of form and function.

Every step in the progress of this study has tended to obliterate the technical barriers by which logicians have sought to separate the inquiries relating to the several parts of man's nature.

The laws of Coexistence;-the adaptation of structure to function; and to a certain extent the elucidation of natural affinities may be legitimately founded upon the examination of fully developed species;-But to obtain an insight into the laws of development,-the signification or bedeutung, of the parts of an animal body demands a patient examination of the successive stages of their development, in every group of Animals.

No naturalist has devoted more painstaking attention to the structure of the barnacles than Mr. Darwin.

The relationship between a Russian and a bottle of vodka is almost mystical.