All this time, he lay upon his bed, the very core and centre of a blaze of ruddy light, which streamed upon it when the clock proclaimed the hour; and which, being only light, was more alarming than a dozen ghosts, as he was powerless to make out what it meant, or would be at; and was sometimes apprehensive that he might be at that very moment an interesting case of spontaneous combustion, without having the consolation of knowing it.
There are no more uses of "combustion" in the book.
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internal combustion engine
Fire codes are strict because of the danger of spontaneous combustion of the ingredients.