PREFACE
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The Romanes Lecture for 1894, as now published, is considerably longer than as originally spoken. In reading the Lecture some portions were omitted, which, although essential for the full appreciation of the argument, were not required for understanding its main drift. These passages have been restored to the text; and some notes have been added. I am indebted to Mr. Gregg Wilson for translating the Lecture into English, and to Prof. W. N. Parker for much help in the revision.
The manuscript had already gone to press when the news reached me of the sudden death of the Founder of the Lectureship. George Romanes has gone from among us. Though the state of his health for the last few years had made it improbable that a long life would be granted to him, no one thought the end was so near when, on the 2nd of May, he was present at
