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the original cause of laughter. Many a comic form, that cannot be explained by itself, can indeed only be understood from its resemblance to another, which only makes us laugh by reason of its relationship with a third, and so on indefinitely, so that psychological analysis, however luminous and searching, will go astray unless it holds the thread along which the comic impression has travelled from one end of the series to the other. Where does this progressive continuity come from? What can be the driving force, the strange impulse which causes the comic to glide thus from image to image, farther and farther away from the starting-point, until it is broken up and lost in infinitely remote analogies? But what is that force which divides and subdivides the branches of a tree into smaller boughs and its roots into radicles? An inexorable law dooms every living energy, during the brief interval allotted to it in time, to cover the widest possible extent in space. Now, comic fancy is indeed a living energy, a strange plant that has flourished on the stony portions of the social soil, until such time as culture should allow it to vie with the most refined products of art.