I. [THREE LECTURES ON EVOLUTION.] (New York, September 18, 20, 22, 1876).
[LECTURE I.] The Three Hypotheses respecting The History of Nature
[LECTURE II.] The Hypothesis of Evolution. The Neutral and the Favourable Evidence
[LECTURE III.] The Demonstrative Evidence of Evolution
II. [AN ADDRESS ON THE OCCASION OF THE OPENING OF THE JOHN HOPKINS UNIVERSITY] (Baltimore, September 12, 1876)
III. [A LECTURE ON THE STUDY OF BIOLOGY, IN CONNECTION WITH THE LOAN COLLECTION OF SCIENTIFIC APPARATUS.] (South Kensington Museum, December 16, 1876)