Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The rainfall of the Ohio Valley fluctuated in clearly defined eight-year cycles during the seventy-two years from 1839 to 1910; The cycles in the Ohio Valley were congruent with those in the United States considered as a unit. The course of rainfall before 1839, when there were no meteorological records in the middle and western portions of the United States, may be a subject of dis pute, and one may have individual doubts as to the course of rainfall in the unrealized future. But the revelations of the existing record of eighty-three years describe a sequence of regular natural changes of such magnitude and of such economic importance that the observant explorer in quest of economic regularities will not ignore their suggestiveness. They supply a clue to the intricate economic disorder.

The rainfall of the Ohio Valley fluctuated in clearly defined eight-year cycles during the seventy-two years from 1839 to 1910; The cycles in the Ohio Valley were congruent with those in the United States considered as a unit. The course of rainfall before 1839, when there were no meteorological records in the middle and western portions of the United States, may be a subject of dis pute, and one may have individual doubts as to the course of rainfall in the unrealized future. But the revelations of the existing record of eighty-three years describe a sequence of regular natural changes of such magnitude and of such economic importance that the observant explorer in quest of economic regularities will not ignore their suggestiveness. They supply a clue to the intricate economic disorder.