5 o Mr. Faraday on two new compounds 
were shut, and the whole left for a short time. When the 
fluid compound of chlorine and olefiant gas had formed and 
condensed on the sides of the vessel, it was again placed over 
olefiant gas, and, in consequence of the condensation of a large 
portion of the gases, a considerable quantity more entered. 
This was left, as before, to combine with part of the remaining 
chlorine, to condense, and to form a partial vacuum ; which 
was again filled with olefiant gas, and the process repeated 
until all the chlorine had united to form the fluid, and the 
vessel remained full of olefiant gas. Chlorine was then ad- 
mitted in repeated portions as before ; consequently, more of 
the fluid formed ; and ultimately a large portion was obtained 
in the bottom of the vessel, and an atmosphere of chlorine 
above it. It was now exposed to sun light. The chlorine 
immediately disappeared, and the vessel became filled with 
muriatic acid gas. Having ascertained that water did not 
interfere with the action of the substances, a small portion 
was admitted into the vessel which absorbed the muriatic acid 
gas, and then another atmosphere of chlorine was introduced. 
Again exposed to the light, this was partly combined with 
the carbon, and partly converted into muriatic acid gas; 
which, being as before absorbed by the water, left space for 
more chlorine. Repeating this action, the fluid gradually 
became thick and opaque from the formation of crystals in it, 
which at last adhered to the sides of the glass as it was 
turned round ; and ultimately the vessel only contained chlo- 
rine with the accumulated gaseous impurities of the successive 
portions ; a strong solution of muriatic acid, coloured blue 
from the solution of a little brass, and the solid substance. 
I have frequently carried the process thus far in retorts ; 
