VI CONTENTS. 



Page 

 the Atmosphere ; and that the Variation 



of Elevation, and of Depression, which 

 the Mercury undergoes, altogether depends 

 on the different degrees (/expansible force 

 which the atmosphere possesses at different 

 times 280 



CHAPTER XVI. 



On C olorification in general; or the Means 

 by tvhich Color is produced, and the Source 

 from whence it is derived, 323 



CHAPTER XVII. 



On the Matter of Temperature in general, 

 and of Refrigeration in particular 340 



CHAPTER XVIII. 



On Calorification. 



SECT. i. On the source from tvhence Fire is 

 derived, and the means by ivhich 

 it is generated 348 



SECT. ii. On the Power of Fire over Li- 

 quids and Gases 365 



SECT. ni. The Cause and Nature of Earth- 

 quakes 370 



