165 



cloud of moschettoes to be found. It formed as 

 it were a particular stratum some feet above the 

 ground, and thickened as we brought lights to 

 illumine the artificial horizon. The inhabitants 

 of Maypures for the most part quit the village, 

 to sleep in the islets amid the cataracts, where 

 the number of insects is less ; others make a fire 

 of brush-wood in their huts, and suspend their 

 hammocks in the middle of the smoke. The 

 centigrade thermometer kept up in the night to 

 27° or 29° ; and in the day to 30°. I found on 

 1 9th of April, at two o'clock in the afternoon, the 

 a granitic sand, loose and coarse grained, 

 60*3 o# ; another granitic sand of the same white 

 colour, but fine grained and more dense, 

 52*5° ; and the temperature of a bare rock of 

 granite 47*6°. The thermometer, at the same 

 time, 8 feet above the ground in the shade was 

 29*6° ; in the sun, 36*2°. An hour after sun- 

 set, the coarse grained sand had the tempera- 

 ture of 32° ; and the granite rock, 38*8° ; the 

 air was then at 28*5° ; the water of the Oroo- 

 noko in the raudal, near the surface, 27*6° ; 

 and that of a fine spring issuing from granite, 

 behind the house of the missionary, 2 7* 8°*^. This 

 is perhaps somewhat less than the mean annual 



* 48.2°. R. Grasses of the freshest green vegetated in this 

 sand. 



+ 22 2 Q R. 



