THEORY DEDUCED FROM PHYSICAL LAWS. 



35 



On comparing together the experiments made on dry air, 

 there appeared but little discrepancy, but this was not so 

 with moist air ; and I was induced to institute a set of ex- 

 periments, to see whether length of time in performing the 

 experiment had any influence on the result. I therefore 

 performed a great number of experiments, similar in all re- 

 spects except the length of time which intervened between 



