C. E. = Collected Essays.
I. Method and Results.
II. Darwiniana.
III. Science and Education.
IV. Science and Hebrew Tradition.
V. Science and Christian Tradition.
VI. Hume, with Helps to the Study of Berkeley.
VII. Man's Place in Nature.
VIII. Discourses, Biological and Geological.
IX. Evolution and Ethics, and other Essays.
S. M. = Scientific Memoirs.
L. L. = Life and Letters, three volume edition.