. Darwin, and after Darwin. An exposition of the Darwinian theory and a discussion of post-Darwinian questions. Evolution; Heredity. 188 Darwin, and after Darwin. " Elsewhere {Origin of Species, p. 158) Mr. Darwin points out that modulations which appear to present obvious utility are often found on further examination to be really useless. This latter consideration, therefore, may be said to act as a foil to the one against which 1 am arguing, namely, that modifications which appear to be useless may nevertheless be useful. But here is a more suggestive consideration, also derived
. Darwin, and after Darwin. An exposition of the Darwinian theory and a discussion of post-Darwinian questions. Evolution; Heredity. 188 Darwin, and after Darwin. " Elsewhere {Origin of Species, p. 158) Mr. Darwin points out that modulations which appear to present obvious utility are often found on further examination to be really useless. This latter consideration, therefore, may be said to act as a foil to the one against which 1 am arguing, namely, that modifications which appear to be useless may nevertheless be useful. But here is a more suggestive consideration, also derived from Mr. Darwin's writings. Among our domesticated productions changes of structure—or even structures wholly new—not unfre- quently arise, which are in every way analogous to the apparently useless distinctions between wild species. Take, for example, the following most instructive case :—. Fig. 2.—Old Iri>h Pig, showing jaw-appendages (after Ricliardson). "'Another curious anomaly is offered by the appendages described by M. Eudes-Deslongchamps as often characterizing the Normandy pigs. These appendages are always attached to the same spot, to the corners of the jaws ; they are cylindrical, about three inches in length, covered with bristles, and with a pencil of bristles rising out of a sinus on one side ; they have a cartilaginous centre with two small longitudinal muscles; they occur either symmetrically on both sides of the face, or on one side alone. Richardson figures them on the gaunt old Irish pig; and Nathusius states that they. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Romanes, George John, 1848-1894. Chicago The Open Court Pub. Co
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