356 Prof. Dove's Outlines of a general Theory of the Winds. 



with SW. from falling into rising, rises with W., NW. and 

 north winds, and passes with NE. from rising into falling. 



The variations in Paris are calculated in millimetres for 

 twelve hours ; in the first 5 years the direction of the wind at 

 midday was observed, in the last 5 years the mean of the 

 entire day. The observations made at Danzig are variations 

 in sixteen hours expressed in Parisian lines; those made at 

 London in English inches from morning to evening, with- 

 out closer determination of the hour of observation. I have 

 omitted the inconsiderable correction for the daily variations 

 at Danzig. 



The magnitude of the variation is in Paris for the morning 

 and evening observation, 



In the 5 years —0-336 —0*01 



In the 10 years —0*2785 +0*0075 



In London —0*007 —0*002 



a. The independence of the phenomenon on the daily periods 

 is evinced by the circumstance that the motion depending 

 thereon in the observations of Paris and London, is eliminated 

 by bringing them together with opposite signs. In Danzig 

 this independence follows from the circumstance (Pog. Ann., 

 vol. xxxi. p. 477) that the variations from 6 o'clock in the 

 morning to 10 at night, coincide completely, as regards the 

 sign, with the variations from 10 at night to 6 in the morn- 

 ing. 



b. The independence on the yearly periods is evinced by 

 the following table, which contains the motions in 12 hours 



