Chap. 12.] [ 475 .] 



CHAP. Xir. 



OF THE HEAT OF THE A T MOS PHERE AND 

 IGNEOUS VAPOURS. 



OljeSls of Meteorology as a Science.' -Partly anticipated. Tempera- 

 ture. Heat of the Earth. Effetts of the Sun's Rays en different 

 Mediums. Difference ivitb refpeSl to Temperature between Land 

 and Water. Effects of Clouds on the Temperature. Of Evapora- 

 tion. U/iufual Cold, ho-iv produced in Summer and Winter.*. 

 Aqueous Meteors. Igneous Meteors. Fire Balls. Shooting Stars. 

 Ig-nes Fatni. 



METEOROLOGY, in its mod extenfive 

 fenfe, would embrace a large fcope of fcience. 

 It includes every thing that concerns our atmofphere, 

 climate, temperature, vapours, fogs, dew, rain, hail, 

 ihow, the igneous vapours, as proceeding from in- 

 flammable air, and even thunder and lightning, and 

 all thofe phenomena which are produced by what is 

 termed natural electricity. 



The arrangement adopted in thefe volumes, which 

 was the cleared that fuggefted itfelf to my mind, ne- 

 ceffarily excludes many of thefe fubjedts from the pre- 

 fent chapter. The electrical phenomena have been 

 already treated of, and the theory of rain, fnow, &c. 

 as adopted by the electrical philofophers, has been 

 briefly explained ; and what remains to be faid on 

 aqueous meteors will be more properly introduced in 

 the book which is dedicated to the fubject of water y 

 and will be better underftood when the properties of 

 that fluid are more fully explained. . 



The 



