Custom, effect of, on laughter, [84], [294], [318].
Customary, the, as standard in comedy, [375]–377.
Cynicism in modern laughter, [431].
Dante, Alighieri, [30], [425].
Darwin, C., [26], [38], [40], [57], [60], [63], [70], [71], [156], [159], [162], [163], [164], 169, [170], [171], [172], [177], [224], [227], [280].
Daudet, A., [378].
David, Mrs. F. W. E., [229].
Deformity, as laughable, [89], [231].
— moral. See Vice.
Degradation, theory of (moral theory), [119]–125, [128], [137], [153].