=Sulphuric Acid.= Death from poisoning with this acid, commonly results in from twelve hours to three days, but sometimes life is prolonged for a week or a fortnight, or for months, and sometimes death may take place in an hour. The morbid appearances met with will vary according to the quantity of the acid taken, and the manner of its administration. The appearances are in general as follows: On the lips, fingers, or other parts of the skin, spots and streaks of a brownish, or yellowish-brown color are met with, where the acid has disorganized the cuticle. The mucous membrane of the tongue and fauces is white; the pharynx is only in the rarest cases carbonized like the stomach, is generally hard to cut, as if tanned, and of a gray color; the vascular injections of its mucous membrane may be recognized. The rima glottidis is sometimes contracted, the epiglottis swelled, and the commencement of the larynx inflamed. The œsophageal membrane is often completely detached, or comes off in shreds; and the passage shows traces of the corroding effects of the poison. The outer surface of the abdominal viscera is commonly either very vascular or livid. The stomach, if not perforated, is commonly distended with gases, and contains a quantity of yellowish-brown or black matter, and is sometimes lined with a thick paste, composed of disorganized tissue, blood and mucus. The pylorus is contracted. If the acid has been taken diluted, the mucous membrane is merely excessively injected, with blackness of the vessels, and usually a softening of the rugæ, or actual removal of the villous coat. If the stomach be perforated, the holes are commonly roundish, with thin, colored and disintegrated margins, and surrounded by vascularity and black extravasations. The inner coat of the duodenum often presents appearances closely resembling those noticed in the stomach. Sometimes, especially in cases which are rapidly fatal, it is not at all affected, probably owing to the spasmodic contraction of the pyloric orifice. The urinary bladder is commonly empty. The blood is thickened, and of an acid reaction. =Nitric Acid.= The appearances observed in cases of poisoning by this acid, are similar to those noticed under sulphuric acid. A difference of tint in the color produced by nitric acid on the skin, lips and mucous lining of the mouth and œsophagus, being the only distinguishing mark. Whereas in the case of sulphuric acid the color is brownish, in the case of nitric acid, it is most frequently yellow. =Oxalic Acid.= This is a poison of great energy, and so more frequently used for committing suicide than for purposes of murder. It has often been taken by accident for Epsom salt, (sulphate of magnesia,) which it greatly resembles in general appearance.