STORMS. 261 



tropics of the southern hemisphere come from the pole and the 

 west, i. e., southwest. 



567. Storm and Rain Charts for the Atlantic Ocean have al- 

 ready been published by the Observatory, and others for the whole 

 seas are in process of construction. The object of such charts is 

 to show the directions and relative frequency of gales in all parts 

 of the sea, the relative frequency of calms, fogs, rain, thunder, and 

 lightning. 



These charts are very instructive. 



