_Blue and Yellow._—These two colours harmonize well, the blue imparting to the yellow an orange tint so much the deeper as the tone of the blue is raised, while the yellow communicates to the blue a beautiful tint of violet, or if the blue have any unpleasant greenish tint the yellow will neutralize it. If, however, there be a great difference in the tone of the two colours, contrast arising from this difference might destroy the effect of the contrast of colours; so that a deep blue might appear black or less violet, while the yellow, being enfeebled, might seem greenish. _Blue and Scarlet._—Deep blue and scarlet make a beautiful assortment, the blue giving fire to the scarlet; the latter rendering the blue more pure. There is no doubt that for effect a clearer blue and a fresh orange would be preferable, if there be no white in the uniform. _Green and Yellow._—This combination pleases by its gaiety, which suits cavalry of the line. But the green should be yellower and clearer than that which associates well with red; for the twofold reason that the yellow, by neutralizing a portion of the yellow in the green, raises the colour of the blue, and consequently lessens the brilliancy of the green. Besides, this effect tends constantly to increase, as the yellow of the green fades sooner than its blue. On the other hand, the yellow cloth receiving red from the green, must not be taken too deep. This case furnishes a good example of the economical advantage of contrasts of colour generally; and it will be seen that good arrangements are so much more difficult to make, as we depart from the contrast of complementary colour. _Of a single Colour and White._ We must refer to our preceding observations with respect to the juxtaposition of white with colours (178) to reason upon these combinations in uniforms. Colours are heightened, their complementaries are added to the white, and effects are produced which are so much the more perceptible as the colours are less raised in tone. If the white is rusty the juxtaposition of blue will heighten its tint; violet placed beside it will clear it, rendering it yellow; green will increase its redness; yellow, and especially orange yellow, will enfeeble it. A white uniform has a good effect, not only when white pantaloons are worn with a white coat, or with facings, collar, &c. of white to a light coloured coat; but it has a good effect also with light trousers; for instance, light blue and white coat, or collar and facings. White trousers also do well with a uni-coloured coat. _Bi-coloured Uniforms with White._