CONTENTS. 



Page 



An Account of some Experiments upon Gunpowder . i 



Experiments to determine the Force of Fired Gun- 

 powder 98 



A Short Account of some Experiments made with Can- 

 non, AND ALSO of SOME ATTEMPTS TO IMPROVE FlELD 



Artillery 173 



Experiments on the Production of Air from Water, 

 exposed with various Substances to the Action of 

 Light .191 



An Account of some Experiments made to determine 

 THE Quantities of Moisture absorbed from the At- 

 mosphere BY various Substances 232 



Of the Propagation of Heat in Fluids. 



Part I. — Of a Remarkable Law which has been found 

 to obtain in the Condensation of Water with Cold, when 

 it is near the Temperature at which it freezes ; and of 

 the Wonderful Effects which are produced by the Opera- 

 tion of that Law in the Economy of Nature. Together 

 with Conjectures respecting the final Cause of the Salt- 

 ness of the Sea . . . . . ' . . . 239 

 Part II. — An Account of several new Experiments, with 

 occasional Remarks and Observations, and Conjectures 

 respecting Chemical Affinity and Solution, and the Me- 

 chanical Principle of Animal Life . . . . -337 



Of the Propagation of Heat in various Substances 401 



An Experimental Inquiry concerning the Source of 

 the Heat which is excited by Friction . . . 469 



^!j}lo 



