space, it exhibits certain coexisting elements so closely interdependent, so exclusively made for one another, that not one of them could, at the same time, belong to two different organisms: each living being is a closed system of phenomena, incapable of interfering with other systems. A continual change of aspect, the irreversibility of the order of phenomena, the perfect individuality of a perfectly self-contained series: such, then, are the outward characteristics—whether real or apparent is of little moment—which distinguish the living from the merely mechanical. Let us take the counterpart of each of these: we shall obtain three processes which might be called repetition, inversion, and reciprocal interference of series. Now, it is easy to see that these are also the methods of light comedy, and that no others are possible.
As a matter of fact, we could discover them, as ingredients of varying importance, in the composition of all the scenes we have just been considering, and, a fortiori, in the children's games, the mechanism of which they reproduce. The requisite analysis would, however, delay us too long, and it is more profitable to study
