Bromine and its Compounds—Iodine and its Compounds—Chlorine and its Compounds—Cyanide of Potassium—Hyposulphite of Soda—Hyphosulphite of Gold—Nitric Acid—Nitro-Muriatic Acid—Hydrochloric Acid—Hydrofluoric Acid—Sulphuric Acid—Accelerating Substances—Liquid Sensitives—Dry Sensitives, etc., etc., . . . . . 72
Light—Optics—Solar Spectrum—Decomposition of Light—Light, Heat, and Actinism—Blue Paper and Color for the Walls of the Operating Room—Proportions of Light, Heat and Actinism composing a Sunbeam—Refraction—Reflection—Lenses—Copying Spherical Aberration—Chromatic Aberration, . . . 131
To make Plates for the Daguerreotype—Determining the Time of Exposure in the Camera—Instantaneous Process for Producing Daguerreotype—Galvanizing the Daguerreotype Plate—Silvering Solution—Daguerreotype without Mercury—Management of Chemicals—Hints and Cautions—Electrotyping—Crayon Daguerreotypes—Illuminated Daguerreotypes—Natural Colors in Heliography—Multiplying Daguerreotypes on one Plate—Deposit in Gilding—Practical Hints on the Daguerreotype, . . . 149
An Account of Wolcott and Johnson’s Early experiments in the Daguerreotype, . . . 188