_Treatment._--Water should not be given, as it increases the solubility of the acid, and thus assists in the more extensive absorption and diffusion of the poison. The carbonates of potash and soda should be avoided, as the oxalates of these alkalies _are themselves_ poisonous. The stomach tube should not be used. Lime is the best antidote, as the oxalate of lime is insoluble, and may be given in the form of common _whiting_; a pint of saccharated lime water may be given. Vomiting should be promoted. In the stage of collapse the case must be treated on general principles. Essential Salt of Lemons The binoxalate of potash or salt of sorrel, or, as it is more commonly known, salt of lemons, occurs as a constituent of many plants. The common sorrel--_Rumex acetosa_--contains it in large quantities. _Symptoms._--Those of poisoning by oxalic acid, on which its poisonous properties depend. _Post-mortem Appearances._--Inflammation of the stomach and intestines. Other appearances as in oxalic acid. _Chemical Analysis._--See oxalic acid. The incinerated salt leaves a white residue of potassium carbonate; oxalic acid leaves no residue. _Fatal Period._--_Eight minutes_ in the case of a lady recently confined, who took half an ounce of the salt by mistake for cream of tartar. _Fatal Dose._--Half an ounce. _Treatment._--The same as recommended for poisoning by oxalic acid. Table showing Symptoms, Post-mortem Appearances, Fatal Dose, Period of Death, and Treatment of Poisoning by