BY GEORGE J. ROMANES, M.A., LL.D., F.R.S., ZOOLOGICAL SECRETARY OF THE LINNEAN SOCIETY. Several months ago I published in the _Fortnightly Review_ a lecture, which I had previously delivered at the Philosophical Institutions of Edinburgh and Birmingham, and which bore the above title. The late Mr. Darwin thought well of the epitome of his doctrine which the lecture presented, and urged me so strongly to republish it in a form which might admit of its being "spread broadcast over the land," that I promised him to do so. In fulfilment of this promise, therefore--which I now regard as more binding than ever--I reproduce the essay in the "Nature Series" with such additions and alterations as ap…
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