Abstract
From a statistical research on the cotton crops in America from 1866 to 1923 the author noticed: -(1) The tendency of negative correlation exists between the crops and sunspot activity (area is concerned). (2) In the increasing phase especially near the minimum of spot-activity, the crops have tendency to increase; in the decreasing phase, especially near the minimum of spot activity, the crops have tendency to increase. In the decreasing phase, especially near the maximum, of the spot activity, the crops tend to decrease. (3) The crops remarkably decrease when the spot activity strikingly increases near its maximum phase, and the crops markedly increase when the spot activity decreases conspicuously near its minimum phase. (4) The correlation between the crops and spot activity exists but it is not as sufficiently large as to be numerically formulated.
