AFTER death, the body, whether of a man, or of an animal, being no longer preserved from destruction by vital force, falls under the dominion of chemical forces. If the body of a dead animal, or a human corpse be kept in a place where the temperature is below 0°, or if it be shut up in a space entirely air-tight, or if it be impregnated with antiseptic substances, it will remain intact, as at the moment at which life has abandoned it. Such is the process of embalming. The effect of the various chemical substances with which a corpse is impregnated, is to coagulate the albumen of the tissues, and thus to preserve the animal substance from putrefaction. A similar result will be obtained if the corpse be placed between two layers of ice, or in a coffin entirely surrounded with ice constantly renewed. If kept at a temperature of 0°, the body will not be subject to decomposition, because putrid fermentation cannot take place at so low a temperature. This was the process by which the entire carcasses of the mammoths, or extinct elephants, which belonged to the quaternity period, were preserved. In 1802 a perfectly preserved carcass of this gigantic pachyderm was found on the bank of the Lena, a river which runs into the Arctic Sea, after traversing a portion of the Asiatic continent in the vicinity of the North Pole. The frozen earth and the ice which covers the banks of the river into which the mammoth had plunged, had so effectually preserved it from putrefaction, that the flesh of the huge creature, dead for more than a hundred thousand years, made a feast for the fishermen of that desert place. In northern countries, if one would preserve the body of a man, it could be effectually done by simply keeping it constantly wrapped in ice. When the body of a man, or of an animal, is exposed to the combined influences of air, of water, and of a moderately high temperature, it undergoes a series of chemical decompositions, whose final term is its transformation into carbonic acid gas, and some compounds, gaseous or solid, which represent the less advanced products of destruction. Gases of various kinds, carbonic acid, hydrosulphuric, and ammoniac, and the vapour of water, spread themselves through the atmosphere, or dissolve into the humidity of the soil. At a later stage these compounds, thus dissolved into the water which bathes the earth, are absorbed by the little roots of the plants which live on it, and aid in their nutrition and development. As for the gas, it begins by spreading through the air; and then falling to the earth again dissolved in the rainwater, it also equally supplies the needs of vegetable life. The ammoniac and carbonic acid in the water which penetrates the soil, is absorbed by the roots, introduced into the tubes of the plants, and supplies them with nourishment.