Mr. Darwin's later works, besides those which we have already named, which are for the most part monographs embodying facts and researches into the manner in which different functions of animals and plants are developed, include "The Various Contrivances by which Orchids are fertilized by Insects" (1862); "The Movements and Habits of Climbing Plants" (1865); "The Expression of the Emotions in Man and Animals" (1872); "Insectivorous Plants" (1875); "The Effects of Cross and Self Fertilization in the Vegetable Kingdom" (1876); "The Different Forms of Flowers and Plants of the Same Species" (1877); "The Power of Movement in Plants" (1881); "The Formation of Vegetable Mould through the Action of Worms, with Observations on their Habits" (1882). All of these works have been received with interest by the public, and have been fully noticed in our pages. The works which have been called forth by the influence of Mr. Darwin's writings are catalogued in a German pamphlet of thirty-six octavo pages, containing the names of three hundred and twelve authors.
Mr. Darwin was subject to frequent sudden attacks of illness which laid him prostrate for days together. The periods of convalescence were made useful for observations requiring almost constant attention; and such observations, made in the sick-room, are referred to in his "Climbing Plants." His tastes were almost wholly scientific. For sculpture or pottery, or even for drawing, except as an aid to botanical and zoölogical pursuits, he cared very little, his collection of pictures being confined to a portrait of old Dr. Darwin and one of Josiah Wedgwood, hanging in his dining-room, and sketches of Sir Joseph Hooker and Professor Huxley in his study.
Commenting on Mr. Darwin's methods of investigation and presentation, "Nature" remarks in a review of one of his books, that, in turning over its pages, "one is almost distracted from the intrinsic interest of the facts and speculations by the sagacity with which the research is carried on, and the skill with which the results are marshaled for our information. It is peculiarly worthy of notice . . . how the reader is allowed, in studying Mr. Darwin's pages, to form his own hypothesis in explanation of the facts, only to be compelled, in due course, as the narrative proceeds, to admit that such hypotheses are utterly untenable." Scientific candor is mentioned as one of his prominent qualities by Mr. J. TV. Judd, who says that, "like his teacher and friend, the late Sir Charles Lyell, he never forgets in his discussions to look at all sides of the questions before him, and to give the fullest expression and weight, alike to the difficulties which he himself detects, and to arguments which opponents may have advanced." This quality is well illustrated in the successive editions of the "Origin of Species," where the author's changes or modifications of views in particular points are frequently acknowledged and recorded.
