Chapters I., Colour Vision and Structure of the Eye--Perception of Colour--Primary and Complementary Colour Sensations.--II., Daylight for Colour Matching--Selection of a Good Pure Light--Diffused Daylight, Direct Sunlight, Blue Skylight, Variability of Daylight, etc., etc.--III., Matching of Hues--Purity and Luminosity of Colours--Matching Bright Hues --Aid of Tinted Films--Matching Difficulties Arising from Contrast.--IV., Examination of Colours by Reflected and Transmitted Lights--Effect of Lustre and Transparency of Fibres in Colour Matching.--V., Matching of Colours on Velvet Pile--Optical Properties of Dye-stuffs, Dichroism. Fluorescence.--VI., Use of Tinted Mediums--Orange Film--Defects of the Eye--Yellowing of the Lens--Colour Blindness, etc.--VII., Matching of Dyed Silk Trimmings and Linings and Bindings--Its Difficulties--Behaviour of Shades in Artificial Light--Colour Matching of Old Fabrics, etc.--VIII., Examination of Dyed Colours under the Artificial Lights --Electric Arc, Magnesium and Dufton, Gardner Lights, Welsbach, Acetylene, etc.--Testing Qualities of an Illuminant.--IX., Influence of the Absorption Spectrum in Changes of Hue under the Artificial Lights--Study of the Causes of Abnormal Modifications of Hue, etc. * * * * * =Reissue of THE ART OF DYEING WOOL, SILK AND COTTON.= Translated from the French of M. HELLOT, M. MACQUER and M. LE PILEUR D'APLIGNY. First Published in English in 1789. Six Plates. Demy 8vo. 446 pp. 1901. Price 5s.; India and Colonies, 5s. 6d.; Other Countries, 6s.; strictly net. =Contents.=