38 INTRODUCTION, 



the wefl or to the north-weft, a reviving frefhnefs im*. 

 mediately fucceeds." Fezzan, according to the 

 map which the fociety has given, lies between 25 and 

 30° of north latitude. 



Mr. Brydone, in his Travels through Sicily, found 

 the thermometer rife to 112. This happened when 

 the wind blew from the fouth-eafl, which is called 

 there the firocco wind, and which is fuppofedto arife 

 from the lands of Africa, in the neighbourhood of 

 Syria. Mr. Jones fays, that if the heat of this was 

 fuch as has been reported by Mr. Brydone, it is pro- 

 bably the hottefl air that has yet been obferved with 

 any accuracy in the known world. However, we find 

 a more modern writer than Mr. Jones give an account 

 of a greater degree of heat in the air than that men- 

 tioned by Mr. Brydone : I mean Mr. Bruce, from 

 whofe Travels I ihall give the following extract : 



" Chendi, by repeated obfervations of the fun and 

 flars made for feveral fucceeding days and nights, I 

 found to be in latitude 16° 38' 2>5^^ north ; and at 

 the fame place, the 13th of Oftober, I obferved an 

 immerfion of the fatellite of Jupiter, from which I con- 

 cluded its longitude to be 33° 24' 4^" eafl of the me- 

 ridian of Greenwich. The higheft degree of the 

 thermorheter of Fahrenheit in the fhade was on the 

 icth of Odober at one o'clock P. M. 119% wind 

 north ; the lowed w^as on the nth at midnight, 78% 

 wind w^eft, after a fmall fhower of rain. The degree 

 of the thermometer does not convey any idea of the 

 efiecl the fun has upon the fenfations of the body or 

 colour of the flvin. Nations of blacks live within la- 

 titude 



