After passing a current of the gas
through the tube for some time, the end was sealed in the blowpipe
flame. The tube was then warmed slightly, and a few bubbles of gas
thus driven out. The end of the index tube dipped under strong
sulphuric acid saturated with chlorine gas, so that, on cooling, a
short column of the acid was drawn up. This served as an index for any
changes of volume which might take place in the chlorine in the tube.
A silent discharge of electricity was then passed. The volume of the
gas was observed to increase slightly, but afterward it remained quite
constant, even after the discharge had been passed for several hours.
We may therefore conclude that no allotropic change takes place when
chlorine gas is subjected to the silent discharge of electricity, the
initial increase of volume being merely due to the heating effect the
discharge has upon the gas. Into another similar tube, filled with
chlorine, was introduced a small quantity of liquid bromine.
The tube thus contained chlorine saturated with bromine vapor. The
silent discharge on being passed through this tube did not produce any
different effect than for chlorine alone.
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