Alison, indeed, ascribes the effects of all colors to association. "White," he says, "as it is the color of day, is expressive to us of the cheerfulness or gayety which the return of day brings: black, as the color of darkness [night], is expressive of gloom and melancholy." And he adds: "Whether some colors may not of themselves produce agreeable sensations, and others disagreeable sensations, I am not anxious to dispute." But this is the very point into which Alison ought to have inquired. Nature does nothing without foundation in the simplest principles; and this foundation is not only anterior to, but is the cause of all association. That, independent of any association, blackness is naturally disagreeable, if not painful, is happily determined by the case of the boy restored to sight by Cheselden, who tells us that the first time the boy saw a black object, it gave him great uneasiness; and that, some time after, upon accidentally seeing a negro-woman, he was struck with great horror at the sight. This appears to be perfectly conclusive. Knight indeed says: "As to the uneasiness which the boy, couched by Cheselden, felt at the first sight of a black object, it arose either from the harshness of its outline, or from its appearing to act as a partial extinguisher applied to his eyes, which, as every object that he saw, seemed to touch them, would, of course, be its effect." It is highly probable that black operates in both these ways; and it has therefore natural effects, independent of all association. As to sounds, Alison observes, that the cries of some animals are sublime, as the roar of the lion, the scream of the eagle, &c.; and he thinks they become so, because we associate them with the strength and ferocity of the animals which utter them. By opposite associations, he accounts for the beauty of the notes of birds. And he says, that there is a similar sublimity or beauty, in the tones of the human voice, and that "such sounds are associated, in our imaginations, with the qualities of mind of which they are in general expressive, and naturally produce in us the conception of these qualities."