On the advisableness of improving natural knowledge -- Emancipation--black and white -- A liberal education, and where to find it -- Scientific education: notes of an after-dinner speech -- On the educational value of the natural history sciences -- On the study of zoology -- On the physical basis of life -- The scientific aspects of positivism -- On a piece of chalk -- Geological contemporaneity and persistent types of life -- Geological reform -- The origin of species -- Criticisms on "The origin of species" -- On Descartes' "Discourse touching the method of using one's reason rightly and of seeking scientific truth" -- Spontaneous generation

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