Miscellaneous Notices on Galvanic Results. 31 
any thing more about them in this place. They were carried 
on with great exactness in the following manner. The gradua- 
ted glass tube of the electro-gasometer being filled with acidula- — 
ted water and inverted over the platinum terminals of the instru- 
ment, one of the polar wires of the battery was connected with 
it, and the other kept in the hand of the experimenter_ready to 
plunge into the other mercurial cup of the instrument the moment 
the word “time” was given, and taken out again when a cubic 
inch of the gases was collected. Mr. Gassiot marked the time 
by astop-watch, Mr. Mason and myself were in turns the experi- 
ei and Mr. Walker recorded the facts as they were a 
to 
- W ith regard to the experiment in which I discovered the 
great differenes produced in the two polar wires, it was undertaken 
from the views which I had long entertained concerning the non- 
identity of the electric and calorific matter, as you will see I have 
hinted at, at the close of section 1, of my first memoir to the 
London Electrical Society. It was late in the evening before I 
had any opportunity of making the experiment. The rest-of the 
party were engaged in something else at the time, and the battery 
was in series of one hundred and sixty pairs. I brought the tip 
ends of the polar wires (copper Fig. 1. 
wire one tenth of an inch diam- 
eter) into contact, end to end, tO 
thus, (Fig. 1,) then withdrew them gently and very gradually 
from each other, keeping the flame in full play between them till 
they were separated about one ~ ae 2. 
fourth of an inch, thus, (Fig. 2.) 
In a few minutes the positive 
wire at P got red hot for about. eit aio: but the Sdeative 
wire never became red. TI repeated this several times,. in order 
to be convinced of the fact. I next laid the wires across one an- 
other, and brought them into contact about an inch from the ex- 
tremities, thus, (Fig. 3,) and separated Fig. 3. 
them as before. In a short time the 
whole of that part from the point of 
crossing to the extremity P, became 
very red hot, but the N end never got even toa dull —— It 
was certainly very hot, but never higher than a black heat. I 
next increased the length of ‘the ends rof the wires exterior to the — 
