FIRST SPECIES—HARMONIES OF ANALOGY.—1. _The harmony of scale_, produced by the simultaneous view of different tones of the same scale, more or less approximating. 2. _The harmony of hues_, produced by the simultaneous view of tones of the same, or nearly of the same depth, belonging to neighbouring scales. 3. _The harmony of a dominant coloured light_, produced by the simultaneous view of various colours assorted according to the law of contrast, but one of them predominating, as would result from the view of these colours through a slightly-coloured glass. 173. SECOND SPECIES—HARMONIES OF CONTRAST.—1. _The harmony of contrast of scale_, produced by the simultaneous view of two very distant tones of the same scale. 2. _The harmony of contrast of hues_, produced by the simultaneous view of tones of different depths, belonging, to neighbouring scales. 3. _The harmony of contrast of colours_, produced by the simultaneous view of colours, belonging to very distant scales, assorted according to the law of contrast. The difference in the depth of the adjacent tones may further augment the contrast of colours. SECTION IV. _Assortments of Red, Orange, Yellow, Green, Blue, Violet with White, Black, and Grey._ 174. It will not be useless to the object of this work to introduce some observations relative to the degree of beauty of certain arrangements of the primitive colours with black, white, and grey. But I cannot too strongly insist upon the fact, that they are not given as a rigorous deduction from scientific rules, for they are only the expression of my particular taste; yet I hope that many classes of artists, especially dressmakers, decorators of all kinds, designers of patterns for woven fabrics, paper-hangings, &c., will find advantage in consulting them. 175. The _ground_, as well as the interval between the colours, having influence upon their effect, all my observations were made with white, black, grey, and coloured circles, ⁴/₁₀ of an inch in diameter, separated by intervals of ⁴/₁₀ of an inch; thirteen circles arranged in a straight line forming a series. 176. The series designed to show the effect of white were on a ground of normal grey; those to show the effect of black and of grey were upon a white ground, slightly tinged with grey. It is necessary to remark that the _coloured_ circles placed apart, were upon black grounds, which must have exercised some influence.