PHYSICAL AND LITERARY. 91 



dip it well corked into a vefTel of cold 

 water, and in a few minutes will be leen 

 drops of water adhering to the lower 

 parts of the glafs- In both experiments, 

 thefe drops will again be abforbed by the 

 air, when its former heat is reftored. 

 This is precifely what happens with re- 

 fpecl to fait difTolved in water. Some 

 part of the fait will in cold be precipitated, 

 and again be abforbed when the water is 

 reftored to its former he^t. The falling 

 of dew after fun-fet, when the heat of the 

 air is fenfibly diminifhed, correfponds 

 perfectly to the fafts mentioned. 



Other phenomena attending evapora- 

 tion are equally analogous to what hap- 

 pen in folatiom. For, firft, folvents or 

 vienjlrua acl only on thofe parts of bodies 

 with which they are in contact ; and fo=- 

 lution, therefore, is promoted by dividing 

 the folvend into fmall parts. Thus wa- 

 ter in cataracfls, by falling from a height 

 and being daftied into fpray, is more 

 copioufly attracfled by the air. Second- 

 ly, It always holds, that, when a menfiru- 



urn is faturated with the body diH^'ved 



in 



