Chapter XVII

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[159] While Rousseau was living at Montmorency "his thought wandered confusedly round the notion of a treatise to be called 'Sensitive Morality or the Materialism of the Age,' the object of which was to examine the influence of external agencies, such as light, darkness, sound, seasons, food, noise, silence, motion, rest, on our corporeal machine, and thus, indirectly, upon the soul also."--_Rousseau_, by John Morley (p. 164).

[160] Butler's _Evolution, Old and New_ (p. 244), and Isidore Geoffroy St. Hilaire's _Histoire naturelle générale_, tome ii., p. 404 (1859).

[161] After looking in vain through both volumes of the _Recherches_ for some expression of Lamarck's earlier views, I found a mention of it in Osborn's _From the Greeks to Darwin_, p. 152, and reference to Huxley's _Evolution in Biology_, 1878 ("Darwiniana," p. 210), where the paragraphs translated above are quoted in the original.

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