_Fatal Period._--Death has occurred in three minutes; also delayed to sixty hours; usually three to four hours. _Fatal Dose._--One drachm has caused death in twelve hours. A child six months old died from the effects of a quarter of a teaspoonful of a solution of one part of the acid to five of glycerine. Recovery has taken place after an ounce of 90 per cent. strength liquefied acid, also after four ounces of the crude acid; after six ounces of the crude acid, 14 per cent. strength; and in a child of two after half an ounce of crude acid of 30 per cent. strength. _Treatment._--Stomach pump. Wash out the stomach with equal quantities of alcohol and water mixed--whisky, brandy, gin, or rum will do until absolute alcohol or rectified spirit be obtained. The washing should be repeated every 5 to 15 minutes from four to eight times; apomorphine hydrochlorate gr. ⅒ should be given hypodermically at the commencement, and the administration of demulcent drinks. Emetics are of little or no use, owing to the anæsthesia of the mucous membrane of the stomach. The sulphate of soda, Glauber salts, has been proposed as an antidote. Any soluble sulphate may be tried. Oil or vinegar is the best outward application to the skin, after washing with spirit of wine or methylated spirits. OXALIC ACID This is a powerful corrosive and cardiac poison, but on account of its strongly acid taste it is ill-adapted for the purposes of the murderer. Deaths have not infrequently followed the accidental substitution of this substance for Epsom salts--sulphate of magnesia--which it somewhat closely resembles. The ordinary crystals of oxalic acid are in the form of four-sided prisms, colourless, transparent, odourless, or with a slight acid smell, very acid taste, and not deliquescent in the air. It is largely used in the arts, by brass-polishers, straw-bonnet makers, book-binders, and others. The acid is also used to remove writing-ink from parchment, paper, &c., for the purposes of forgery, &c.