The following fact graphically illustrates the influence of carbonic acid on human life. A young Frenchman, M. Deal, finding his hopes of cutting a figure in the world rather dubious, resolved to commit suicide; but that he might not leave the world without producing a sensation and flourishing in the newspapers, he resolved to kill himself with carbonic acid. So, shutting himself up in a close room, he succeeded in his purpose, leaving to the world the following account, which was found near his dead body, the next morning. "I have thought it useful, in the interest of science, to make known the effects of charcoal upon man. I place a lamp, a candle, and a watch on my table, and commence the ceremony. "It is a quarter past ten. I have just lighted the stove; the charcoal burns feebly. "Twenty minutes past ten. The pulse is calm, and beats at its usual rate. "Thirty minutes past ten. A thick vapor gradually fills the room; the candle is nearly extinguished; I begin to feel a violent headache; my eyes fill with tears; I feel a general sense of discomfort; the pulse is agitated. "Forty minutes past ten. My candle has gone out; the lamp still burns; the veins at my temple throb as if they would burst; I feel very sleepy; I suffer horribly in the stomach; my pulse is at eighty. "Fifty minutes past ten. I am almost stifled; strange ideas assail me.... I can scarcely breathe.... I shall not go far.... There are symptoms of madness.... "Eleven o'clock. I can scarcely write.... My sight is troubled.... My lamp is going out.... I did not think it would be such agony to die.... Ten...." Here followed some quite illegible characters. Life had ebbed. The following morning he was found on the floor. The steamer Londonderry left Liverpool for Sligo, on Friday, December 2d, 1848, with two hundred passengers, mostly emigrants. A storm soon came on. The captain ordered the passengers into the steerage cabin, which was eighteen feet long, eleven wide, and seven high. The hatches were closed, and a tarpaulin fastened over this only entrance to the cabin. The poor creatures were now condemned to breathe the same air over and over again. Then followed a dreadful scene. The groans of the dying, the curses and shrieks of those not yet in the agonies of death, must have been inconceivably horrible. The struggling mass at length burst open the hatches, and the mate was called to gaze at the fearful spectacle. Seventy-two were already dead, many were dying, their bodies convulsed, the blood starting from their nostrils, eyes, and ears. It does not appear that the captain designed to suffocate his passengers, but that he was simply ignorant of the fact that air which has passed to and fro in the lungs becomes a deadly poison.