that is to say, they have been able to exhibit some red substance which, though at first apparently solid, melted after an interval without any direct application of heat.
(that; is; to say, they have been able to exhibit some red substance) (they; to exhibit; some red substance which, though at first apparently solid, melted after an interval without any direct application of heat) (some red substance; melted; T:after an interval without any direct application of heat)
that they some red substance
is to exhibit melted
to say, they have been able to exhibit some red substance
some red substance which, though at first apparently solid, melted after an interval without any direct application of heat
T:after an interval without any direct application of heat