DIRECTION. 



U3 



opposite direction E.N.B. only six. These two directions divide tlie winds into the two classes, 

 and all winda between E.N.E. and W. tlirough X. blow from the Ross Sea to the Barrier, 

 and all winds between S.S.W. and E.X.E. through S. blow from the Barrier to the Ross Sea. 



It is clear from the above discussion that the wind observations at Cape Evans give 

 no indications beyond the fact that the pressure is such that the air flows in one or other 

 of the directions through the Sound. Beyond this there can be no close connexion between 

 the wind direction and the pressure gradient or any other meteorological factor. It has there, 

 fore been found very useful to group together all the winds of one class and neglect 

 the small variations within that class. Thus all the winds enumerated above which blow 

 from the Ross Sea through the Sound to the Barrier have been grouped together and will in 

 future be referred to as noi-t.herly winds. Similarly all the winds which blow in the opposite 

 direction have been grouped together and will be referred to as southerly winds. 



Tlie following table shows the result of combining the winds into these two main classes. 



Table 64.* 



* In this tablo the wincl for which the direction was vaiialile or unknown has heen divided amongst N. and 

 S._ in jiroportion to tlie recorded fn-queiioy. tlius if the frequency of the S. winds was twice that of the jj. 

 winds one-third of tlie doulitfiil whids has been included under N. ' and Iwo-tjiirds under S. 



15 



