116. Relative Toxicity of Sodium, Potassium, and Ammonium Salts, 122 117. Sodium Salts, 122 118. Potassium Salts--Potassic Sulphate--Hydropotassic Tartrate-- Statistics, 122 119. Action on the Frog’s Heart, 122 120. Action on Warm-Blooded Animals, 122, 123 121. Elimination, 123 122. Nitrate of Potash, 123 123. Statistics, 123 124. Uses in the Arts, 123 125. Action of Nitrates of Sodium and Potassium--Sodic Nitrite, 123, 124 126. _Post-mortem_ Appearances from Poisoning by Potassic Nitrate, 124 127. Potassic Chlorate, 124 128. Uses, 124 129. Poisonous Properties, 124 130. Experiments on Animals, 124, 125 131. Effects on Man--Illustrative Cases of the Poisoning of Children by Potassic Chlorate, 125 132. Effects on Adults--Least Fatal Dose, 126 133. Elimination, 126 134. Essential Action of Potassic Chlorate on the Blood and Tissues, 126 135. Detection and Estimation of Potassic Chlorate, 126, 127 _Toxicological Detection of Alkali Salts._ 136. Natural occurrence of Potassium and Sodium Salts in the Blood and Tissues--Tests for Potassic and Sodic Salts--Tests for Potassic Nitrate--Tests for Chlorates--Ammonium Salts, 127, 128 PART V.--MORE OR LESS VOLATILE POISONOUS SUBSTANCES CAPABLE OF BEING SEPARATED BY DISTILLATION FROM NEUTRAL OR ACID LIQUIDS. HYDROCARBONS--CAMPHOR--ALCOHOL--AMYL NITRITE--ETHER--CHLOROFORM AND OTHER ANÆSTHETICS--CHLORAL--CARBON BISULPHIDE--CARBOLIC ACID--NITRO-BENZENE--PRUSSIC ACID--PHOSPHORUS. I. HYDROCARBONS. 1. _Petroleum._