_Symptoms._ Morbid symptoms vary according to the agent swallowed. There are colics, anxious countenance, small accelerated pulse, rapid breathing, hyperthermia, and salivation, especially marked with mercuric chloride. The buccal mucosa may give valuable indications, becoming white with muriatic acid, or zinc, or antimony, or mercuric chloride, yellow with nitric acid, and white changing to black with sulphuric acid or silver nitrate. Ferric or cupric sulphate may give their respective colors to the saliva, and the former will darken the fæces. The mouth is usually dry, hot, and clammy, and the edges of the tongue red. Temperature is usually elevated, yet with tartar emetic it may be distinctly reduced. Thirst is usually marked, and urination frequent. Icterus and albuminuria attend on phosphorus poisoning. When vomiting takes place the appearance or analysis of the matters rejected, or otherwise of the urine, will often indicate the nature of the poison. _Lesions._ The gastric mucosa is congested and discolored, but the corrosion and even the ulceration are especially characteristic. Patches of necrotic mucous membrane may be more or less detached exposing a deep red submucosa. The coloration otherwise varies;—white or black with sulphuric acid or silver nitrate; white with muriatic acid, the caustic alkalies, or zinc chloride; yellow with nitric acid; or green with salts of copper. Similar lesions are found on the buccal, œsophagean and intestinal mucosæ, and even at times on the respiratory.