in the disgusting and health-destroying observation of human diseases, which alone can enable us to understand, alleviate, or remove them. On no other terms can we be considered as real students of our profession--to confer that which sick kings would fondly purchase with their diadem--that which wealth cannot purchase, nor state nor rank bestow--to alleviate the most insupportable of human afflictions." Such is the enthusiasm of the physiologist of genius, who elevates the demonstrations of anatomical inquiries by the cultivation of the intellectual faculties, connecting "man with the common Master of the universe." This enthusiasm inconceivably fills the mind of genius in all great and solemn operations. It is an agitation amidst calmness, and is required hot only in the fine arts, but wherever a great and continued exertion of the soul must be employed. The great ancients, who, if they were not always philosophers, were always men of genius, saw, or imagined they saw, a divinity within the man. This enthusiasm is alike experienced in the silence of study and amidst the roar of cannon, in painting a picture or in scaling a rampart. View DE THOU, the historian, after his morning prayers, imploring the Divinity to purify his heart from partiality and hatred, and to open his spirit in developing the truth, amidst the contending factions of his times; and HAYDN, employed in his "Creation," earnestly addressing the Creator ere he struck his instrument. In moments like these, man becomes a perfect unity--one thought and one act, abstracted from all other thoughts and all other acts. This intensity of the mind was felt by GRAY in his loftiest excursions, and is perhaps the same power which impels the villager, when, to overcome his rivals in a contest for leaping, he retires hack some steps, collects all exertion into his mind, and clears the eventful bound. One of our admirals in the reign of Elizabeth held as a maxim, that a height of passion, amounting to frenzy, was necessary to qualify a man for the command of a fleet; and NELSON, decorated by all his honours about him, on the day of battle, at the sight of those emblems of glory emulated himself. This enthusiasm was necessary for his genius, and made it effective. But this enthusiasm, prolonged as it often has been by the operation of the imaginative existence, becomes a state of perturbed feeling, and can only be distinguished from a disordered intellect by the power of volition possessed by a sound mind of withdrawing from the ideal world into the world of sense. It is but a step which may carry us from the wanderings of fancy into the aberrations of delirium. The endurance of attention, even in minds of the highest order, is limited by a law of nature; and when thinking is goaded on to exhaustion, confusion of ideas ensues, as straining any one of our limbs by excessive exertion produces tremor and torpor.