GENERAL CIRCULATION OF THE ATMOSPHERE 279 



example of this control of summer and winter weather by the 

 annual migration of the sun and the wind system. 



FIG. 207. A summer month. Low pressure in interior. Storm tracks far 

 to north. Prevailing southerly winds. Precipitation distributed far inland. 



FIG. 208. Pressure and prevailing winds of the globe for January. 



306. Conclusion. The heat of the sun and the rotation of 

 the earth produce the general system of winds. This shifts 



