52 ELEMENTS OF GENERAL SCIENCE 



FIG. 32. Results of a tornado 



Trees and buildings demolished by the tornado of May 26, 1917. This tornado 



began in Missouri, crossed Illinois, and almost crossed Indiana, leaving a path 



of destruction as evidence of the power of rapidly moving air 



lower winds are from a westerly direction more frequently 

 than from any other. It is true also that the upper air cur- 

 rents in this region are from the west, as is shown by the 

 movement of the higher clouds. This is always from the west. 



