It is of interest to consider what must be the physical condition of
the gas at these high temperatures. All the hydrocarbons which are
afterward condensed must then be in the condition of gases having
various degrees of condensability, mixed with and rendered visible by
a cloud of carbon particles or soot. If this soot could be removed
from the gas at this stage without reducing the temperature, we should
probably have no thick tar or pitch, but only comparatively
light-colored oils; and it might possibly lead to an entirely
different mode of conducting the process of condensation.
These are a few of the subjects on which it is extremely desirable
that we should possess that complete information which can only be
obtained by well-directed investigations with different materials and
under varying conditions. There are many others in connection with
carbonization and purification which might be mentioned; but I think I
have said sufficient to show the necessity that exists for more minute
investigation and research.
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