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. 
