As I before told you, there is yet much uncertainty as to the nature of these subtle agents. But I am inclined to consider heat not as mere motion, but as a separate substance. Late experiments too appear to make it a compound body, consisting of the two electricities, and in our next conversation I shall inform you of the principal facts on which that opinion is founded.
[*] This rule, if not universal, admits of very few exceptions.
[†] See [a]page 102].
[*] This experiment was first devised by Mr. Leslie, and has since been modified in a variety of forms.
[*] This mode of making the experiment was proposed, and the particulars detailed, by Dr. Marcet, in the 34th vol. of Nicholson’s Journal, page 119.
[CONVERSATION V.]
ON THE CHEMICAL AGENCIES OF ELECTRICITY.
MRS. B.
Before we proceed further it will be necessary to give you some account of certain properties of electricity, which have of late years been discovered to have an essential connection with the phenomena of chemistry.
CAROLINE.