On Winds. 517 



tloned ;) and four days is as fhort a time as can be allowed to 

 the foiith-weft to (iipply the more eaftcin north-weft. (Meiii. 

 Peterfburgh 1778, p. 92.) So alfo in the fame journal I find, 

 that from the ^th to the 30th of May a north wind prevailed 

 in the eaftern part of our hemifphere from latitude 58" to 61% 

 except fevenieen days of variable winds ; but in London it 

 blew from the fouth-weft during the firil fifteen days of June, 

 thus replacing the northern air. And to replace the conftant 

 norili-eall wind on the Indian peninfula to the Moluccas, 

 there is a conftant draught from the fouth in the weftern 

 parts of our hemifphere; accordingly Leflce obferved, that 

 on an average of twelve years it blew 126 davs each year, 

 from Ocli)ber until May, from fome fouth point, namely, 

 86 days from the fouth or fouth-weft^ and 40 from the fouth- 

 eaft, at Abo, latitude 60°. 



It is true, that he found it to take place very frequently 

 alio in fummer; but this is occafioned by the great heat that 

 then prevails in the northern trafts of Lapland. 



And, upon the whole, more of the fouth air is drawn off 

 in winter than in fummer; for its flow is gentle in fnmmer, 

 but often ftormy in wioter. See Lelke's 9th, nth, and ,3th 

 tables. If all other meteorological tables of a feries of years 

 had been arranged with equal fagacitv and precifion as thole 

 of Leche and Dr. Horfelcy, a vaft fund of information might, 

 be extrafted from them. 



At Peterfburgh, during the year 1793, Euler junior found 

 a fouth or fouth-weft wind prevailed 79 days, 52 from Oc- 

 tober to the end of March, and only 27 in the fummer 

 months : it was ftormy in November, December, and Janu- 

 ary. I have not noted the fouth-eaft. 



Mr. Stritter alio found the fouth wind to pred(jminatc at 

 Mofcow during the fix winter months of that year, (N. Afta 

 Petrop. xi. p. 569 :) fo that the frequency of this wind in 

 high latitudes is certain. 



Of Northerly Winds. 



In the weftern parts of our continent and hcmifjihere thefe 

 are of all others the leaft frequent in latitudes above 48°. See 

 La Cotte's and Leche's tables. The caufe of this unfrc- 

 quency appears from what has been fajd of Ibuth winds. 



But in latitudes below 48*^ thev occur oftener, and ofteneft 

 in thofe that are ftill lower, as La Cotte reinarks. An ad- 

 mirable inftancc of Divine Providence, that the warmcft 

 winds fliould prevail olteneft in winter in the. coldeft regions, 

 and cold winds in the warmcft ! 



Uut it may be ulked, wliy a foulh wind fliould not prevail 



5 i" 



