Domestic Encyclopædia (1802)/Laughter

LAUGHTER, a sudden and convulsive expression of mirth, peculiar to the countenance of man; and which is occasioned by some object that surprizes the fancy.

This emotion, however, more frequently arises from an unexpected disappointment of the mind, while its attention is arrested by an object apparently of great importance; but suddenly terminating in ridicule, or insignificance.—With respect to its influence on the body, moderate laughter is very beneficial; for it contributes to promote the circulation of the blood through the lungs, and has frequently removed colics, pains in the stomach, and similar complaints. Various instances have likewise occurred, in which deep-seated ulcers of the lungs and liver, that could not be relieved by any remedies, bursted, and were perfectly cured by a fit of laughter, artificially excited. Beside the pleasing sensations with which it is accompanied, this affection powerfully operates on the organs of digestion, and greatly contributes to the assimilation of food.