Eifel; while in all his goings and comings through scenes where Nature worked more unobtrusively, he had watched her never-ending toil, as she destroyed with the one hand and built with the other. He was thus able to write with the authority of one who has seen, not of one who merely quotes; of one who knew, not of one who had learnt by rote. The "Principles of Geology," though of course it had to rely not seldom on the work of others, bore the stamp of the author's experience, and was redolent, not of the dust of libraries, but of the sweetness of the open air. That fact added no little force to its cautious and clear inductive reasoning; that fact did much to disarm opposition, and to open the way to victory. FOOTNOTES: [55] Strictly speaking, fifteen out of the last sixteen chapters, for the final one (dealing with coral reefs) is substantially a reprint. [56] "Principles of Geology," vol. i. p. 26 (eleventh edition). [57] _In Memoriam_, cxxiii. [58] "Principles of Geology," chap. iii. p. 37. [59] "Principles of Geology," chap. iv. [60] "Principles of Geology," chap. iv. [61] Hutton's "Theory of the Earth" was first published in 1788, and in an enlarged form in 1795. Playfair's "Illustrations of the Huttonian Theory" appeared in the spring of 1802. [62] Geikie's "Life of Murchison," chap. vii. [63] "Principles of Geology," chap. iv. [64] "Principles of Geology," chap. iv. [65] Abridged from Lyell's summary: "Principles of Geology," chap. vii. CHAPTER VI. EIGHT YEARS OF QUIET PROGRESS.