Book digitized by Google from the library of University of Michigan and uploaded to the Internet Archive by user tpb. "The first seventeen chapters of the present book appeared some years age, wholly or in part, in a version of vol. I of the Souvenirs entomoligiques ... Of the remainder, The modern theory of instinct first saw the light in the English review and An unknown sense, in an abbreviated form, in the Daily mail."--Translator's note
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