"The perspiratory pores on the palm of the hand, are found to be 3,528 in a square inch; now each of these pores being the aperture of a little tube of about a quarter of an inch long, it follows that in a square inch of skin on the palm of the hand, there exists a length of tube equal to 882 inches, or 73-1/2 feet. Such a _drainage_ as 73 feet in every square inch of skin, assuming this to be the average for the whole body, is something wonderful; and the thought naturally intrudes itself, What if this _drainage were obstructed? Could we need a stronger argument for enforcing the necessity of attention to the skin?_ On the pulps of the finger, where the ridges of the sensitive layer of the true skin are somewhat finer than the palm of the hand and on the heel, where the ridges are coarser, the number of pores on the square inch was 2,268, and the length of tube 567 inches, or 47 feet. To obtain an estimate of the length of tube of the perspiratory system of the whole surface of the body, I think," says Dr. Wilson, "that 2,800 might be taken as a fair average of the number of pores in the square inch, and 700 consequently of the number of inches in length. Now the number of square inches of surface in a man of ordinary height and bulk is 2,500, the number of pores therefore, 7,000,000, and the number of inches of perspiratory tube 1,750,000, that is 145,833 feet, or 48,000 yards, or nearly 28 miles. "This is only a specimen of the extraordinary structure. "Besides the perspiratory vessels, the skin is provided with vessels for secreting an oily substance, which is of a different nature at different parts of the body; with vessels to repair abrasion and provide for its growth, and carry off its decayed parts; with nerves and blood-vessels that are probably as numerous and extensive as the perspiratory vessels. "It must at the same time be remembered, that the interior skin or mucous membrane, is provided with equally numerous and complicated vessels, to answer some analogous purposes. The whole of them may be affected by applications to the external skin." Dr. Wilson has, in his work, introduced some equally curious and instructive passages, as to the formation and uses of the oil-glands, the structure and functions of the hair, the influence of diet and clothing, and the effect of exercise and cleanliness on the health of this extensive organ. V.--IS HYDROPATHY A PANACEA? AND WHAT COMPLAINTS ARE CURABLE BY IT? Dr. Rauss, author of a work on hydropathy which passed through several editions, says, "It is almost impossible for any one to die of an acute disease, in whom reaction can be produced, and who from the commencement is treated Hydropathically.