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Sect. X.] 



A.ND BAROMETRIC CURVES. 



341 



Sr, 



northward, the symmetricaJ character of this type 

 considerably departed from ; each locality possessing its 

 own type of the barometric movement dm'hjg !No.^mber. 

 The desiderata in immediate connection with the No- 

 vember movements, as observed In the southern and 

 south-eastern parts of England, that present themselves, 

 are — the determination of the type^^ for November, espe- 

 cially its middle portion, as exhibited on the oceanic 

 surface within an area comprised between the SOtli and 

 60th parallels, and the 1st and 40th meridians west. 

 Vessels sailing M'ithin this area may contribute greatly to 



the determination of these types by making observation 



tt 



.k^ 



at intervals of thn^e liours from the 1st of November to 

 the 7th or 8th of December. The entire period of the 

 great symmetrical wave of November will mtist probably 



as 



the annual depression of the 28th. For the elevation 

 of the 25th of December the three-hourly observations 

 should be commenced on the 21st, and continued until 

 the 3rd or 4th of the succeeding January. 



With respect to the gi*eat wave of November, our 

 knowledge of it would be much increased by such a series 

 of observations as mentioned above, being made on board 

 surveying and other vessels employed off Scotland and 

 Ireland ; vessels navigating the North oea ; 



^-^"'MS 



I 



sta- 

 tioned off the coasts of France, Spain, Portugal, and th; 



e 



northern parts of Africa, and at all our stations in the 

 Mediterranean. In this way the area of examJnation 



would be greatly enlarged, and 



diff. 



curves more fully elucidated ; and this extended aica of 

 observation is the more desirable, as there is some reason 



