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V. ■ 



V 



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Sect, IX.] 



METEOROLOGY. 



309 



unprovided with. The dii^ection of the ^ind after the 

 complete passage of the hurricane is a point of interest, 



as indicating whether the " cyclone " consist in the bodily 



transfer of a given mass of rotating air, or in the successive 

 transmission of a rotary movement from air to air in situ, 

 the air in each point of its track being only transiently 

 agitated. 



Winds. 



The points most important to remark respecting the 



wind are, 



1st. Its average intensity and general direction during 

 the several portions of the day devoted to observation. 



2ndly. The hours of the day or niglit when it com- 

 mences to blow from a calm, or subsides into one from a 



breeze. 



Srdly. The hours at which any remarkable changes of 



its direction take place. 



4thlv. The course which it takes in veering, and the 



quarter in which it ultimately settles. 



5thly. The usual course of periodical tvinds, or such as 



remarkably prevail during certain seasons, with the law 



> - 



of their diurnal progress, both as to direction and inten- 

 sity : at what hours and by what degrees they commei 

 attain their maximum, and subside ; 



1 AO 



and through what 



points of the compass they run in so doing. 



The 



of 



heights in the atmosphere, as indicated by the courses 

 the clouds, in different strata. 



7thly. The times of settlng-in of remarkably hot or 

 cold winds, the quarters from which they come, and their 



'+. 



