_Ludicrous_ is a general term, signifying, as we may conjecture from its derivation, what is playsome, sportive, or jocular. _Ludicrous_ therefore seems the genus, of which _risible_ is a species, limited as above to what makes us laugh.
However easy it may be, concerning any particular object, to say whether it be risible or not; it seems difficult, if at all practicable, to establish beforehand any general character by which objects of this kind may be distinguished from others. Nor is this a singular case. Upon a review, we find the same difficulty in most of the articles already handled. There is nothing more easy, viewing a particular object, than to pronounce that it is beautiful or ugly, grand or little: but were we to attempt general rules for ranging objects under different classes, according to these qualities, we should find ourselves utterly at a loss. There is a separate cause which increases the difficulty of distinguishing risible objects by a general character. All men are not equally affected by risible objects; and even the same person is more disposed to laugh at one time than another. In high spirits a thing will make us laugh outright, that will scarce provoke a smile when we are in a grave mood. We must therefore abandon the thought of attempting general rules for distinguishing risible objects from others. Risible objects however are circumscribed within certain limits, which I shall suggest, without pretending to any degree of accuracy. And, in the first place, I observe, that no object is risible but what appears slight, little, or trifling. For man is so constituted as to be seriously affected with every thing that is of importance to his own interest or to that of others. Secondly, with respect to the works both of nature and of art, nothing is risible but what deviates from the common nature of the subject: it must be some particular out of rule, some remarkable defect or excess, a very long visage, for example, or a very short one. Hence nothing just, proper, decent, beautiful, proportioned, or grand, is risible. A real distress raises pity, and therefore cannot be risible. But a slight or imaginary distress, which moves not pity, is risible. The adventure of the fulling-mills in Don Quixote is extremely risible; so is the scene where Sancho, in a dark night, tumbles into a pit, and attaches himself to the side by hand and foot, there hanging in terrible dismay till the morning, when he discovers himself to be within a foot of the bottom. A nose remarkably long or short is risible; but to want the nose altogether, far from provoking laughter, raises horror in the spectator.