The term was first used in a scientific context by Charles Lyell in the third edition (1851) of his book "Elements of Geology" in relation to missing parts of the geological column, but it was popularized in its present meaning by its appearance on page xi of his book "Geological Evidences of the Antiquity of Man" of 1863. By that time, it was generally thought that the end of the last glacial period marked the first appearance of humanity; Lyell drew on new findings in his "Antiquity of Man" to put the origin of human beings much further back. Lyell wrote that it remained a profound mystery how the huge gulf between man and beast could be bridged. Lyell's vivid writing fired the public imagination, inspiring Jules Verne's "Journey to the Center of the Earth" (1864) and Louis Figuier's 1867 second edition of "La Terre avant le déluge" ("Earth before the Flood"), which included dramatic illustrations of savage men and women wearing animal skins and wielding stone axes, in place of the Garden of Eden shown in the 1863 edition.