DIRECTION OF ADVANCE 41 



The persistence of the waves in their original courses, contrasted 

 with the fact that the wind may either blow in a uniform direction 

 across the surface of the ocean for hundreds of miles, be veering in 

 character, or shift abruptly, makes the relationship between the direc- 

 tions of the one and of the other extremely complex. The case is still 

 further confused by the fact that while the velocity of the wind 

 usually does not differ greatly from that of the waves if the weather 

 is stormy, the rate of advance of a wind system as a whole is usually 

 considerably slower than for the winds within it, or for the waves 

 produced by it, so that the waves generated by one system very 

 commonly run to regions that are dominated by a different barometric 

 distribution where the wind blows from some other direction. Thus 

 the possible range between the directions of waves and of winds 

 cannot be reduced to any one simple rule. 



