387 



Vera Cruz, 28-7° ; at the Havannah, 29 5°. The 

 daily difference at the same hour, scarcely ex- 

 ceeded 0*8° or 1*4°. During this period it rain- 

 ed but four times, and then only for seven or 

 eight minutes. At this season, the yellow fever 

 prevails ; which usually disappears at La Guay- 

 ra, as at Vera Cruz *, and the island of St. Vin- 

 cent, when the temperature of the day descends 

 below twenty three, or twenty four degrees. 

 The mean temperature of the hottest month 

 was, at La Guayra, nearly 29*3° ; at Cumana, 

 29-1°; at Vera Cruz, 27*7° ; at Cairo, according 

 to Nouet, 29*9° ; at Rome, 25°. From the 16th 

 of November to the 19th of December, the 

 mean temperature of noon, at La Guayra, was 

 only 24-3°; at night, 21*6°. This is the time 

 at which the sufferings from heat are the least ; 

 and yet I do not believe, that the thermometer 

 ever falls (and it is lowest a little before sun- 

 rise) below 21°. It sometimes descends at Cu- 

 mana to 21-2°; at Vera Cruz, to 16°; at the 

 Havannah (always when the north wind blows), 

 to 8° and even lower. The mean temperature 

 of the coldest month -f- is, in these four places, 

 23 2°, 26 8°, 211°, 210°. At Cairo, it is 13 4°. 

 The mean of the whole year, according to good 



* Now. Espagne, vol. ii, p. 765. 



+ The mean of the hottest month at Paris is 19* or 20°, 

 consequently 3 or 4 degrees less than the coldest month at 

 La Guayra. 



2 c 2 



