68. General Properties of Hydrochloric Acid--Discovery--Uses-- Tests, 91, 92 69. Statistics, 92, 93 70. Fatal Dose, 93 71. Amount of Free Acid in the Gastric Juice, 93, 94 72. Influence of Hydrochloric Acid on Vegetation--Present Law on the Subject of Acid Emanations from Works--The Resistant Powers of various Plants, 94 73. Action on Cloth and Manufactured Articles, 95 74. Poisonous Effects of Hydrochloric Acid Gas--Eulenberg’s Experiments on Rabbits and Pigeons, 95, 96 75. Effects of the Liquid Acid--Absence of Corrosion of the Skin-- Pathological Appearances--Illustrative Cases, 96, 97 76. _Post-mortem_ Appearances--Preparations in the different London Museums, 97, 98 77. (1) Detection of Free Hydrochloric Acid--Günzburg’s Test--A. Villiers’s and M. Favolle’s Test--(2) Quantitative Estimation, Sjokvist’s Method--Braun’s Method, 98-101 78. Method of Investigating Hydrochloric Acid Stains on Cloth, &c., 101, 102 III. NITRIC ACID. 79. Properties of Nitric Acid, 102, 103 80. Use in the Arts, 103 81. Statistics, 103 82. Fatal Dose, 104 83. Action on Vegetation, 104 84. Effects of Nitric Acid Vapour--Experiments of Eulenberg and O. Lassar--Fatal Effect on Man, 104, 105 85. Effects of Liquid Nitric Acid--Suicidal, Homicidal, and Accidental Deaths from the Acid, 105, 106 86. Local Action, 106 87. Symptoms--The Constant Development of Gas--Illustrative Cases, 106, 107 88. _Post-mortem_ Appearances--Preparations in various Anatomical Museums, 107-109 89. Detection and Estimation of Nitric Acid, 109, 110 IV. ACETIC ACID. 90. Symptoms and Detection, 110 V. AMMONIA.