Origin of Eight-Year Generating Cycle 



71 



The Dakotas 



France 



FiorRE 18. Cycles in the yield of wheat, oats, and barley in the Dakotas, the United 

 States, the United Kingdom, and France. 



The Dakotas: y = 3.20 sin (l|Ji°' + 93" 50'), origin at 1882; 



The United States: y = 2.49 sia (Mi^^ + 111" 27'), origin at 1882; 



The United Kingdom: y = 3.02 sin (3.6£°4 + 142° 0'), origin at 1884; 



France: y = 2.17 sin (5.|2.°« +292° 56'), origin at 1879. 



