On Radiant Matter - A Lecture Delivered to the British Association for the Advancement of Science, at Sheffield, Friday, August 22, 1879 #225953

If we conceive a change as far beyond vaporisation as that is above fluidity, and then take into account also the proportional increased extent of alteration as the changes rise, we shall perhaps, if we can form any conception at all, not fall far short of Radiant Matter; and as in the last conversion many qualities were lost, so here also many more would disappear.