As to the date of the Neolithic man, or of the last section of the Stone Age, Professor J. Geikie writes: "Any term of years I might suggest would be a mere guess; but I have written to little purpose, however, if the phenomena described in the preceding chapters have failed to leave the impression upon the reader, that the advent of Neolithic man in Europe must date back far beyond fifty or seventy centuries." (_Prehistoric Europe_, p. 558.) The chronology gathered from Genesis has been supposed to place the date of man's creation at a point far less remote. Usher's calculation, attached to the authorized English Version of the Bible, sets this date at 4004 B.C. The discussion of these questions of Scriptural chronology belongs to theology and biblical criticism. It may be observed here, however, that of the three forms in which Genesis is handed down to us,--the Hebrew text, the Samaritan Pentateuch, and the Septuagint, or ancient Greek translation,--no two agree in the numbers on which the estimate is founded. Hence Hales and Jackson, following the larger numbers in the genealogies of the Septuagint, place the date of the creation at a point about fourteen hundred years prior to that fixed upon by Usher. ANCIENT AND MODERN HISTORY. The periods of history are not divided from one another by merely chronological limits, according to intervals of time of a definite duration. Such a classification may be of use to the memory, but it is arbitrary in its character. The landmarks of history are properly placed at the turning-points where new eras take their start, whether the intervals between them are longer or shorter. Of these natural divisions, the most general and the most marked is that between ancient and modern history. Ancient history not only precedes modern in time: it is distinguished from the latter as relating to a by-gone state of things. Modern history, on the contrary, deals with an order of things now existing. Between the two there is this line of demarkation.