Note 7 — APPENDICES

For a discussion of the modern theories as to the laws governing climatic changes and the possibility of their cyclical recurrence, see Huntington, "The Pulse of Asia," pp. 365 ff. It seems most probable that the changes are of solar origin, the variations being caused by varying forms of heat and other energy received from the sun. Such changes would be more intensely felt in mid-continental areas, where high mountains tend to intercept moisture from the sea, which is precipitated without hindrance in the peripheral or coastal regions.