CHAPTER V.--COLOUR.

Harmony and dissonance--Names of tints--Authorities for theories--Art of colouring--Expression of colouring-- Purple--Red--Crimson--Blue--Yellow--Pliny--Renouf--Chinese colours--Indian dyes--Persian colours--Dyes of the Gauls--Romans--Scotch--Scales of colour--MM. Charton and Chevreul on tones of colour--Gas colours 175