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“Naturæ leges et regulæ, secundum quas omnia fiunt et ex unis formis in alias mutantur, sunt ubique et semper eadem.”
B. De Spinoza, Ethices, Pars tertia, Præfatio.
I. THREE LECTURES ON EVOLUTION. (New York, September 18, 20, 22, 1876).
III. A LECTURE ON THE STUDY OF BIOLOGY, IN CONNECTION WITH THE LOAN COLLECTION OF SCIENTIFIC APPARATUS. (South Kensington Museum, December 16, 1876)