40 INTRODUCTION. 



pofition to faint comes on, and a flraitnefs is found 

 in the temples, as if a fmall cord was drawn tight 

 round the head, the voice impaired, the fkin dry, and 

 the head feems, more than ordinary, large and 

 light. 



^- At Sennaar from 70 to 78 in Fahrenheit is cool ; 

 from 79 to 92 temperate, at 92 begins warm. Al- 

 though the degree of the thermometer marks a greater 

 heat than is felt by the body of us llrangers, it feems 

 to me that the fenfations of the natives bear ftill a 

 lefs proportion to that degree than ours. On the 

 2d of Auguft, when I was lying perfeftly enervated 

 pn a carpet in a room deluged with water, at twelve 

 o'clock, the thermometer at 1 1 6, I faw feveral black 

 labourers pulling down a houfe with great vigour, 

 without any fymptoms of being at all incommoded.'* 



When the air is heated to 11 6 degrees, the evapo- 

 ration mud be great * ; fo that Mr. Bruce, in 

 that cafe, I think, mufl have been as if in a hot 



bath 



* Dr. Watfon, in Kis Chemical EfTays, fays that 1973 gallons 

 of water can be raifed from an acre of ground in twelve hours, 

 when the heat at the furface of the ground is 96, 



** During the extreme heat of the wind from the land, I have 

 feen the mercury in Fahrenheit's thermometer rife in the fhade to 

 1 14 degrees. I have known feveral inftances of perfons dying fudden- 

 jy during the heat ; yet thefe accidents were to be afcribed to intem- 

 perance, or to their expofing themfelves improperly abroad, rather 

 than to the fole and immediate heat of the weather, which is not 

 thought dan<^erous, or even unhealthy, to thofe who live with mor 

 deration, and do not go out in the exceflive heat of the day.'' Sec 

 Sketches relating to the Hiftory, &c. of the Hindoos, p. 411. 



t)ath. 



