1. Preliminaries 122 2. Analysis of Nitrous Gas by Charcoal 126 3. Analysis of Nitrous Gas by Pyrophorus 132 4. Additional observations on the composition of Nitrous Gas 134 5. Absorption of Nitrous Gas by Water 140 6. Absorption of Nitrous Gas by Water of different kinds 147 7. Absorption of Nitrous Gas by solution of pale green Sulphate of Iron 152 8. Absorption of Nitrous Gas by solution of green muriate of Iron 179 9. By Solution of Nitrate of Iron 187 10. By other metallic Solutions 189 11. Action of sulphurated Hydrogene on solution of green sulphate of iron impregnated with Nitrous Gas 191 12. Additional Observations 193 DIVISION V. EXPERIMENTS _and_ OBSERVATIONS _on the production of_ NITROUS OXIDE _from_ NITROUS GAS _and_ NITRIC ACID _in different modes_. 1. Preliminaries 197 2. Conversion of Nitrous Gas into Nitrous Oxide by alkaline sulphites 199 3. By Muriate of Tin 202 4. By Sulphurated Hydrogene 203 5. Decomposition of Nitrous Gas by Nascent Hydrogene 206 6. Miscellaneous Observations 209 7. Recapitulation 211 8. Production of Nitrous Oxide from Metallic Solutions 213 9. Additional Observations relating to the production of Nitrous Oxide 219 10. Decomposition of Aqua regia by platina, and evolution of a gas analogous to oxygenated muriatic acid, and nitrogene 222 11. Action of the electric spark on a mixture of Nitrogene and Nitrous gas 229 12. General remarks on the production of Nitrous Oxide 231 RESEARCH II. _Into the combinations of_ NITROUS OXIDE, _and its decomposition_. DIVISION I. EXPERIMENTS _and_ OBSERVATIONS _on the combinations of_ NITROUS OXIDE.