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Jelly-Fish, Star-Fish, and Sea-Urchins: Being a Research on Primitive Nervous Systems

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Mental Evolution in Man: Origin of Human Faculty

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A Candid Examination of Theism

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Mental Evolution in Man: Origin of Human Faculty

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Animal Intelligence: The International Scientific Series, Vol. XLIV

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The Life and Letters of George John Romanes, M.A., LL.D., F.R.S

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A Candid Examination of Theism

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Thoughts on Religion

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The Scientific Evidences of Organic Evolution

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Darwin, and After Darwin (Vol 3 of 3) Post-Darwinian Questions: Isolation and Physiological Selection

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Darwin, and After Darwin, Volume 2 Post-Darwinian Questions: Heredity and Utility