1043. NITRE--_Saltpetre._--This, in over-doses, produces violent poisonous symptoms. Vomiting should be immediately induced by large doses of mucilaginous, diluent drinks; but emetics which irritate the stomach should not be given. -=-=-=-=-=-=-=-=-=-=-=-= 1035. What is the antidote? 1036. What should immediately be done when arsenic is swallowed? 1037. What is the antidote? Can any quantity of this preparation of iron be given without injurious results? 1038. What should be given when verdigris has been taken into the stomach? 1039. What is the antidote? 1040. What should immediately be given when sugar of lead is taken? 1041. What is the antidote? 1042. Give the treatment when corrosive sublimate has been swallowed. 1043. What effect has an over-dose of saltpetre? What treatment should be adopted? -=-=-=-=-=-=-=-=-=-=-=-= 1044. ZINC.--Poisoning is sometimes caused by the _sulphate of zinc_, (white vitriol.) When this takes place, vomiting should be induced, and aided by large draughts of mucilaginous and diluent drinks. Use the stomach-pump as soon as possible. 1045. The antidote is the _carbonate_, or _super-carbonate of soda_. 1046. NITRIC, (aqua fortis,) MURIATIC, (MARINE ACID,) OR SULPHURIC (OIL OF VITRIOL,) ACIDS, may be taken by accident, and produce poisonous effects. 1047. The antidote is _calcined magnesia_, which should be freely administered, to neutralize the acid and induce vomiting. When magnesia cannot be obtained, the _carbonate of potash_ (salæratus) may be given. _Chalk_, powdered and given in solution, or strong _soap suds_, will answer a good purpose, when the other articles are not at hand. It is of very great importance that something be given speedily, to neutralize the acid. One of the substances before mentioned should be taken freely, in diluent and mucilaginous drinks, as gum-water, milk, flaxseed, or slippery-elm tea. Emetics ought to be avoided. 1048. OXALIC ACID.--This acid resembles the sulphate of magnesia, (epsom salts,) which renders it liable to be taken, by mistake, in poisonous doses. Many accidents have occurred from this circumstance. They can easily be distinguished by tasting a small quantity. _Epsom salts_, when applied to the tongue, have a very bitter taste, while _oxalic acid_ is intensely sour. 1049. The antidote is _magnesia_, between which and the acid a chemical action takes place, producing the oxalate of magnesia, which is inert. When magnesia is not at hand, _chalk_, _lime_, or _carbonate of potash_, (salæratus,) will answer as a substitute. Give the antidote in some of the mucilaginous drinks before mentioned. No time should be lost in introducing the stomach-pump as soon as a surgeon can be obtained.