24 Mr. W. Stevenson on the Aurora, and the connexion which 



Note, — The above observations were taken three times a day. 

 The preponderance of the numbers under the cardinal and se- 

 condary points (asW.and S.W.) over those under the intermediate 

 points (as W.S.W.), is due to the circumstance of the observa- 

 tions when the wind was unsteady, veering, or its precise direc- 

 tion not readily ascertainable, being registered rather under the 

 nearest principal point than under a subordinate one. The same 

 remark is also applicable to the table of the motions of cirri. 



Comparison of the two preceding Tables. 



267 



Motions of cirri. 

 No. of observations. 

 From points between N.W. and~\ 

 N.N.E. (both inclusive) . J 

 From N.E. to E.S.E. do. 8 



From S.E. to S.S.W. do. 187 



From S.W. to W.N.W. do. 496 



958 



or, proportionally, and neglecting fractions, — 



Motions of cirri. 



N.W. to N.N.E. inclusive 774 



N.E. to E.S.E. ... 23 



S.E. to S.S.W. ... 542 



S.W. to W.N.W. ... 1438 



Winds. 

 No. of days. 



660 



471* 



402 



1244| 



2778£ 



2777 



Winds. 



660 



471 



402 



1244 



2777 





The cases in which the upper currents move from the easterly 

 points are thus remarkably few. Of the eight instances men- 

 tioned above, the greater number (if not the whole) were scarcely 



