SECTION I.—ON THE LAW OF SIMULTANEOUS CONTRAST OF COLOURS, AND OF ITS DEMONSTRATION BY MEANS OF EXPERIMENT 4 CHAP. I.—Manner of observing the Phenomena of the Simultaneous Contrast of Colours. Definition of Simultaneous Contrast 4 CHAP. II.—The Law of the Simultaneous Contrast of Colours, and the Formula which represents it 8 CHAP. III.—The Law of Simultaneous Contrast of Colours demonstrated by the Juxtaposition of a certain Number of Coloured Bodies 10 CHAP. IV.—On the Juxtaposition of Coloured Surfaces with White 18 CHAP. V.—On the Juxtaposition of Coloured Bodies with Black 19 CHAP. VI.—On the Juxtaposition of Coloured Bodies with Grey 21 CHAP. VII.—On the Juxtaposition of Coloured Bodies belonging to the Colours of the same Group of Coloured Rays 24 CHAP. VIII.—On the Application of the Law of Contrast to the Hypothesis that Red, Yellow, and Blue are the only Primary Colours; and that Orange, Green, Indigo, and Violet are Secondary or Composite Colours 25 SECTION II.—ON THE DISTINCTION BETWEEN SIMULTANEOUS, SUCCESSIVE, AND MIXED CONTRAST OF COLOURS, AND ON THE CONNEXION BETWEEN THE EXPERIMENTS MADE BY THE AUTHOR, AND THOSE PREVIOUSLY MADE BY OTHER OBSERVERS. DISTINCTION BETWEEN SIMULTANEOUS, SUCCESSIVE, AND MIXED CONTRAST OF COLOURS 29 PART THE SECOND. ON THE APPLICATION OF THE LAW OF SIMULTANEOUS CONTRAST OF COLOURS 34 Introduction 34 Definition of the words Tones, Scales, and Hues 34 Of Diagrams designed to represent and define Colours and their Modifications 36 Harmony of Colours 46 Assortments of Red, Orange, Yellow, Green, Blue, and Violet with White, Black, and Grey 49 Colours with White 50 Colours with Black 54 Colours with Grey 58 FIRST DIVISION.—IMITATION OF COLOURED OBJECTS WITH COLOURED MATERIALS IN A STATE OF INFINITE DIVISION 68 Introduction 68 Painting on the System of Chiaro-’scuro 69 Painting on the System of Flat Tints 81