Vegetable Staticks. 63 



July 30. I began to keep a regifter of 

 their rife and fall. During the following 

 month of Auguji^ J obferved that when 

 the fpirit in the thermometer^ numb. 1, 

 ( which was expofed in the Sun ) was about 

 noon rifen to 48 degrees, then the fecond 

 thermometer was 45 degrees, the fifth 33, 

 and the fixth 3 1 ; the third and fourth at 

 intermediate degrees. The fifth and fixth 

 Thermometer kept nearly the fame degree 

 of heat both night and day, till towards 

 the latter end of the month ; when, as the 

 days grew morter and cooler, and the nights 

 longer and cooler, they then fell to 25 and 

 27 degrees. 



Now, fo considerable a heat of the Sun, 

 at two feet depth, under the earth's furface, 

 muft needs have a ftrong influence in raif- 

 ing the moifture at that and greater depths ; 

 whereby a very great and continual wreak 

 muft always be afcending, during the warm 

 fummer feafon, by night as well as day; for 

 the heat at two feet depth is nearly the fame 

 night and day, the impulfe of the Sun- 

 beams giving the moifture of the earth a 

 briilc undulating motion, which watery par- 

 ticles, when feparated and rarefied by heat, 

 do afcend in the form of vapour : And the 



vigour 



