§ 53,54. HUES AND TONES. 91 



The foregoing list will suffice to show the uncertainty of 

 the ordinary names of colours, and how often they are applied 

 to very different kinds. But in order to fix those even in our 

 own language, it would be necessary to give coloured speci- 

 mens of each, with their most important tones and hues; and as 

 this would far exceed my limits, I confine myself to the colours 

 commonly required for decorative purposes, which are given 

 in Plate in.; and refer the reader to a very useful work on 

 the subject ("Werner's Nomenclature of Colours " *), where he 

 will find a great number of them treated in a very practical 

 manner, with their hues illustrated by references to objects in 

 the animal, vegetable, and mineral world. 



53. Varieties of a colour are hues ; thus, different kinds of 

 blue, as a cobalt-blue, indigo-blue, sky-blue, &c, are hues of 

 blue ; and olive and emerald-green are hues of green, &c. 



Various intensities of a colour are tones, i. e. different 

 shades of the same kind of blue, as different tones or shades of 

 cobalt and others ; and this distinction has very properly been 

 observed by M. Chevreul in his very ingenious and useful 

 work on the Harmony of Colours; where he has given, what 

 was so much wanted, observations and facts relating to the 

 juxtaposition of colours and their effects. 



It is always desirable, in order to avoid confusion, and to 

 simplify a subject, that those who write upon it should, as 

 far as their opinions will allow, adopt the same nomenclature 

 and definitions; and as I find so much in M. Chevreul in 

 accordance with my own views, I shall endeavour to deviate 

 as little as possible from the terms he employs ; and though 

 there are some few points in which I differ from him, I am 

 glad that so many of his observations accord with my own. 



54. I am far from pretending to lay down rules for the 

 application of colours ; and it will suffice to mention those facts 



* By Syme. Edinburgh, 1814. 



