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nature or the names of the logical processes; but as far as it lay in my power I have avoided setting my foot on controversial ground. There are in the book, no doubt, many errors in detail, but it is hoped that no serious ones have crept in. I wish to thank Professor Francis Darwin of Cambridge, England, and President David Starr Jordan of Stanford University, both of whom made important suggestions, and Professor H. B. Lathrop of Stanford University, who carefully revised the manuscript.
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Origin of Species, Sixth Edition, 1872.
Descent of Man and Selection in Relation to Sex, 1871.
Variation of Animals and Plants under Domestication, Second Edition, 1875.
Expression of the Emotions in Man and the Lower Animals, 1872.
A Monograph of the Cirripedia, Vol. I., 1851 ; Vol. II., 1854.
The Formation of Vegetable Mould through the Action of Earthworms, 1881.
Naturalist's Voyage around the World, 1860.
Geological Observations on Volcanic Islands and on Parts of South America, Second Edition, 1876.
Structure and Distribution of Coral Reefs, Third Edition, 1889.
Fertilization of Orchids, Second Edition, 1877.
Effects of Cross- and Self-Fertilization, 1876.
Different Forms of Flowers on Plants of the same Species, 1877.
Insectivorous Plants, 1875.
Climbing Plants, 1875.
Power of Movement in Plants, by Charles and Francis Darwin, 1881.
Life and Letters of Charles Darwin, by Francis Darwin, two vols., 1887.
A scIENTIFIC discovery is the outcome of an interesting process of evolution in the mind of its author. When we are able to detect the germs of thought in which such a discovery has originated, and to trace the successive stages of the reasoning by which the crude idea has developed into an epochmaking book, we have the materials for reconstructing an important chapter of scientific history. — PROF. J. W. JUDD, Critical Introduction to Bettany's Edition of Darwin’s “Structure and Distribution of Coral Reefs.”