Speculations on this subject seem to be profitless, because there are no data for determining them. The _facts_ in the case are not of a character to enable us to pronounce positively either that these operations are or are not essential to its existence. It may be that in sleep and in a swoon these phenomena exist, and no memory is retained of them, and it is equally probable that at such intervals all mental operations entirely cease. But, now that the mind has been furnished by the senses with its splendid acquisitions, upon which its reflective powers can act, it is easy to believe that it might continue to exist and to be in active exercise if all its bodily senses, and even its material envelope, were destroyed. Should we never again behold the light of heaven, nor be charmed with the profusion of varied color and form, still the mind could busy itself with pleasing visions of brilliant dyes, of graceful outline, and fair proportion, as bright and as beautiful as any objects of sense could awaken. Should we never again inhale the freshness of morning or the perfumes of spring, the mind itself could furnish from its stores some treasured incense, never to be entirely exhaled. Should the palate never again be cooled by the freshening water of spring, or be refreshed by the viands of the luxuriant year, yet fancy could spread forth her golden fruits and sparkling juices in banquets as varied and profuse as ever greeted the most fastidious taste. Should the melodies of speech and of music be heard no more, and the sweet harmonies of nature and of art forever be hushed, yet the exulting spirit could warble its own songs, and melt in ecstasies with imagined harmonies. And should the grasp of friendship rejoice us no more, nor the embrace of affection send joy to the heart, yet still the spirit would not be desolate, for it could gather around it the beings most loved, and still feel the embraces of affection. Conceptions are distinguished into two classes with reference to this one fact, that some of our conceptions are attended with a consciousness that they have existed before, and others are not. Those conceptions which are thus attended with the feeling of their resemblance to past perceptions or conceptions are called ideas of _memory_; those of our _perceptions_ also which are attended with this recognition are called memory.