1 98 Mr. Morgan’s Obfervations and Experiments on 
proportion to this perfection. There are flames, however, 
which confifl; of burning particles, whofe rays have partly 
efcaped before they afcended in the form of vapour. Such 
would be the flame of a red-hot coal, if expofed to fuch a heat 
as would gradually difperfe it into vapour. When the fire is 
very low under the furnace of an iron foundery, at the upper 
orifice of the chimney a red flame of this kind may be feen, 
which is different from the flame that appears immediately after 
frefh coals have been thrown Upon the fire; for, in confe- 
quence of adding fuch a fupply to the burning fuel, a vail: 
column of fmoke afcends, and forms a medium fo thick as to 
abforb mold of the rays excepting the red. 
I Experiments on electric light* 
If we would wifh to procure any degree of certainty in any 
hypothefis which we may form concerning eleCtrical light, 
perhaps the following general deductions may be of fome ier- 
vice to us. 
1. There is no fluid or folid body in its paflkge through 
which the eleCtric fluid may not be made luminous. In water, 
fpirits, oil, animal fluids of all kinds, the difcharge of a Ley- 
den phial of almofl: any fize will appear very fplendid, pro- 
vided we take care to place them in the circuit, fo that the 
fluid may not pafs through too great a quantity of them. My 
general method is to place the fluid, on which I mean to make 
the experiment, in a tube three-quarters of an inch in diameter, 
and four inches long. I flop up the orifices of the tube with 
two corks, through which I pufh two pointed wires, fo that the 
points may approach within one-eighth of an inch to each 
other. 
a 
