(SEEING that Prof. Huxley, with his well-known candour, felt constrained to admit that the study of rudimentary or vestigial characters had done more than that of any other class of facts to produce general acceptance of the doctrine of evolution, and that at the same time he acknowledged the double-edged nature of these characters, it is not out of place to appraise the evidential value of certain of them.
Encyclop. Brit., vol. ii. p. 157.