hue in Nature is a compound of two or more of the primary colours in various proportions. Greys and Browns are compounds of all three of the primary colours in unequal proportions. Black results from a mixture of all three primary colours of equal intensity and in equal proportions. Harmony of colour is of several kinds; it will be sufficient, how- ever, for our purpose to consider two kinds only, namely, Harmony of Analogy and Harmony of Contrast. The term "Harmony of Analogy" is understood to mean that arrangement in which the colours succeed each other in the order in which they occur in the prism, and the eye is led in progressive steps, as it were, through three or more distinct colours, from Yellow, through Orange, to Scarlet and Deep Red, or from Yellow Harmony of Colours 51 through Green to Blue, Dark Blue and Black, or vice versa. The same term is also applied to the succession of three or more different hues or shades of the same colour. The term " Harmony of Contrast" is applied to combinations of two or more colours, which are contrasted with each other, according to the laws of which we have spoken. In the first kind of harmony the effects are softer and more mellow, in the second more bold and striking. Baxter in his prints affords us examples of both kinds of Harmony, but those of the Harmony of Analogy are more abundant. Of the more brilliant examples of this kind of Harmony, one may mention the beauti- ful succession of colours in the cloud effects at sunset or sunrise. Of a more sober kind is that which prevails in landscapes, where the blue colour of the hills in the distance changes as it advances towards the foreground through olive and every variety of cool and warm green to the sandy bank glowing with yellow, orange, or red ochreous hues at