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[6] Carpenter's Principles of Comparative Physiology, pp. 616–17.

[7] With the exception, perhaps, of the Myxinoid fishes, in which what is considered as the nasal orifice is single, and on the median line. But seeing how unusual is the position of this orifice, it seems questionable whether it is the true homologue of the nostrils.

[8] In the Westminster Review for April, 1857; and now reprinted in this volume.

[9] See Essay on "Progress: its Law and Cause."

[10] This was written before the publication of the Origin of Species. I leave it standing because it shows the stage of thought then arrived at.