51. Varieties and Strength of the Sulphuric Acids of Commerce-- Properties of the Acid--Nordhausen Sulphuric Acid, 75, 76 52. Properties of Sulphuric Anhydride, 76 53. Occurrence of Free Sulphuric Acid in Nature, 76 54. Statistics--Comparative Statistics of different Countries, 76, 77 55. Accidental, Suicidal, and Criminal Poisoning--Sulphuric Acid in Clysters and Injections, 77, 78 56. Fatal Dose, 78, 79 57. Local Action of Sulphuric Acid--Effects on Mucous Membrane, on the Skin, on Blood, 79, 80 58. Action of Sulphuric Acid on Earth, Grass, Wood, Paper, Carpet, Clothing, Iron--Caution necessary in judging of Spots-- Illustrative Case, 80, 81 59. Symptoms--(1) External Effects--(2) Internal Effects in the Gullet and Stomach--Intercostal Neuralgia, 81-83 60. Treatment of Acute Poisoning by the Mineral Acids, 83 61. _Post-mortem_ Appearances--Rapid and Slow Poisoning-- Illustrative Cases, 83-85 62. Pathological Preparations in the different London Hospital Museums, 85, 86 63. Chronic Poisoning, 86 _Detection and Estimation of Free Sulphuric Acid._ 64. General Method of Separating the Free Mineral Acids--The Quinine Process--The Old Process of Extraction by Alcohol--Hilger’s Test for Mineral Acid, 87, 88 65. The Urine--Excretion of Sulphates in Health and Disease--The Characters of the Urine after taking Sulphuric Acid, 88-90 66. The Blood in Sulphuric Acid Poisoning, 90 67. The Question of the Introduction of Sulphates by the Food-- Largest possible Amount of Sulphates introduced by this Means-- Sulphur of the Bile--Medicinal Sulphates, 90, 91 II. HYDROCHLORIC ACID.