It is true that we cannot test caloric by the touch, but it does not appear to us that an appreciation of caloric involves any other sense than that of ordinary cutaneous feeling; the feeling of heat or cold is a mere sensation, agreeable or painful as circumstances may be, and it is natural that we should wish to experience that temperature which is most congenial to us. We say that marble is cold and wood warm, yet both may be of the same temperature; but the marble produces a sensation of coolness, because it rapidly abstracts caloric from the part applied to it; the skin is, in fact, a very imperfect thermometer, yet sufficient for all ordinary purposes. It conceals the machinery of our bodies, giving beauty of outline and appearance, and being provided with a most minute network of nerves of sensation, it gives us warning by the pain experienced of what things are to be avoided. "A burned child dreads the fire" is an old saying, and a boy who has been stung by a nettle will not rashly meddle with the plant again. All our senses require training and education; they are taught, even as we are taught language. It is some time before the infant sees distinctly, or forms any idea of size, proportion, or distance; long before it hears accurately, and understands a word of speech; longer still before it discriminates between musical notes; it is long before delicious odours are relished, and long before there is much distinction of flavour in food, for instinct directs the infant to its mother's breast, and for many a year sweet viands are chiefly acceptable. Habit, exercise, practice, then improve the power and acuteness of the senses, but simple feeling is blunted by habit and exercise. It is, we think, Mr. Lane who tells us, that in Egypt and elsewhere, persons who have hoarded wealth are in the habit of inflicting the bastinado on themselves, increasing the number of strokes by degrees, in order to inure themselves to a mode of extortion of which they are constantly in dread. They hope to be able to weary out their tormentors, or convince them by endurance of their poverty, and so preserve their bags of gold and silver. Idolatrous devotees in India accustom themselves to self-inflicted torture, and feel much less than we might suppose; nay, even in our own country, in times of spiritual darkness, when by mortification and penance men hoped to merit heaven, how many have worn a shirt of horsehair till custom had made it no hardship! The ancient Britons bore, almost unclothed, the severities of winter; and we have read a story, but where we cannot recollect, to the following purport:--A North American Indian was asked, how, nearly naked as he was, he bore with such ease the summer's heat and the winter's cold; he asked the inquirer, how his face, exposed to the weather, endured the changes. My face, said the white man, is hardened to it; and I, retorted the red man, am face all over.