7 6 Vegetable Statkks. 



vapours which are raifed by the warmth of 

 the earth, are by the cooler air foon con- 

 denfed into a vifible form. And I have ob- 

 ferved the fame difference between the cool- 

 nefs of the air, and the warmth of water in 

 a pond, by putting my Thermometer, which 

 hung all night in the open air in fummer 

 time, into the water, juft before the rifmg of 

 the fun, when the like reek or fog was rifmg 

 on the furface of the water. 



CHAP. II. 



Experiment s, whereby to find out the force 



with which Trees imbibe moijlure. 



HA V I N G in the i ft chapter feen many 

 proofs of the great quantities of li- 

 quor imbibed and perfpired by vegetables, 

 I propofe in this, to enquire with what force 

 they do imbibe moifture. 



Tho' vegetables ( which are inanimate ) 

 have not an engine, which, by its alternate 

 dilatations and contractions, does in animals 

 forcibly drive the blood through the arte- 

 ries and veins ; yet has nature wonderfully 

 contrived other means, moft powerfully to 

 raife and keep in motion the fap, as will 



in 



