"In a fine summer's night, when the sky is loaded only with some light vapours, sufficient to stop and to refract the rays of the sun, walk out into an open plain, where the first fires of Aurora may be perceptible. You will first observe the horizon whiten at the spot where she is to make her appearance; and this radiance, from its colour, has procured for it, in the French language, the name of aube, (the dawn,) from the Latin word alba, white. This whiteness insensibly ascends in the heavens, assuming a tint of yellow some degrees above the horizon; the yellow as it rises passes into orange; and this shade of orange rises upward into the lively vermilion, which extends as far as the zenith. From that point you will perceive in the heavens behind you the violet succeeding the vermilion, then the azure, after it the deep blue or indigo colour, and, last of all, the black, quite to the westward.

"Though this display of colours presents a multitude of intermediate shades, which rapidly succeed each other, yet at the moment the sun is going to exhibit his disk, the dazzling white is visible in the horizon, the pure yellow at an elevation of forty-five degrees; the fire color in the zenith; the pure blue forty-five degrees under it, toward the west; and in the very west the dark veil of night still lingering on the horizon. I think I have remarked this progression between the tropics, where there is scarcely any horizontal refraction to make the light prematurely encroach on the darkness, as in our climates.

"Sometimes the trade-winds, from the north-east or south-east, blow there, card the clouds through each other, then sweep them to the west, crossing and recrossing them over one another, like the osiers interwoven in a transparent basket. They throw over the sides of this chequered work the clouds which are not employed in the contexture, roll them up into enormous masses, as white as snow, draw them out along their extremities in the form of a crupper, and pile them upon each other, moulding them into the shape of mountains, caverns, and rocks; afterwards, as evening approaches, they grow somewhat calm, as if afraid of deranging their own workmanship. When the sun sets behind this magnificent netting, a multitude of luminous rays are transmitted through the interstices, which produce such an effect, that the two sides of the lozenge illuminated by them have the appearance of being girt with gold, and the other two in the shade seem tinged with ruddy orange. Four or five divergent streams of light, emanated from the setting sun up to the zenith, clothe with fringes of gold the undeterminate summits of this celestial barrier, and strike with the reflexes of their fires the pyramids of the collateral aerial mountains, which then appear to consist of silver and vermilion. At this moment of the evening are perceptible, amidst their redoubled ridges, a multitude of valleys extending into infinity, and distinguishing themselves at their opening by some shade of flesh or of rose colour.

"These celestial valleys present in their different contours inimitable tints of white, melting away into white, or shades lengthening themselves out without mixing over other shades. You see, here and there, issuing from the cavernous sides of those mountains, tides of light precipitating themselves, in ingots of gold and silver, over rocks of coral. Here it is a gloomy rock, pierced through and through, disclosing, beyond the aperture, the pure azure of the firmament; there it is an extensive strand, covered with sands of gold, stretching over the rich ground of heaven; poppy-coloured, scarlet, and green as the emerald.

"The reverberation of those western colours diffuses itself over the sea, whose azure billows it glazes with saffron and purple. The mariners, leaning over the gunwale of the ship, admire in silence those aerial landscapes. Sometimes this sublime spectacle presents itself to them at the hour of prayer, and seems to invite them to lift up their hearts with their voices to the heavens. It changes every instant into forms as variable as the shades, presenting celestial colors and forms which no pencil can pretend to imitate, and no language can describe.

"Travellers who have, at various seasons, ascended to the summits of the highest mountains on the globe, never could perceive, in the clouds below them, any thing but a gray and lead-colored surface, similar to that of a lake. The sun, notwithstanding, illuminated them with his whole light; and his rays might there combine all the laws of refraction to which our systems of physics have subjected them. Hence not a single shade of color is employed in vain, through the universe; those celestial decorations being made for the level of the earth, their magnificent point of view taken from the habitation of man.

"These admirable concerts of lights and forms, manifest only in the lower region of the clouds the least illuminated by the sun, are produced by laws with which I am totally unacquainted. But the whole are reducible to five colors: yellow, a generation from white; red, a deeper shade of yellow; blue, a strong tint of red; and black, the extreme tint of blue. This progression cannot be doubted, on observing in the morning the expansion of the light in the heavens. You there see those five colors, with their intermediate shades, generating each other nearly in this order: white, sulphur yellow, lemon yellow, yolk of egg yellow, orange, aurora color, poppy red, full red, carmine red, purple, violet, azure, indigo, and black. Each color seems to be only a strong tint of that which precedes it, and a faint tint of that which follows; thus the whole together appear to be only modulations of a progression, of which white is the first term, and black the last.

"Indeed trade cannot be carried on to any advantage, with the Negroes, Tartars, Americans, and East-Indians, but through the medium of red cloths. The testimonies of travellers are unanimous respecting the preference universally given to this color. I have indicated the universality of this taste, merely to demonstrate the falsehood of the philosophic axiom, that tastes are arbitrary, or that there are in Nature no laws for beauty, and that our tastes are the effects of prejudice. The direct contrary of this is the truth; prejudice corrupts our natural tastes, otherwise the same over the whole earth.

"With red Nature heightens the brilliant parts of the most beautiful flowers. She has given a complete clothing of it to the rose, the queen of the garden: and bestowed this tint on the blood, the principle of life in animals: she invests most of the feathered race, in India, with a plumage of this color, especially in the season of love; and there are few birds without some shades, at least, of this rich hue. Some preserve entirely the gray or brown ground of their plumage, but glazed over with red, as if they had been rolled in carmine; others are besprinkled with red, as if you had blown a scarlet powder over them.

"The red (or rayed) color, in the midst of the five primordial colors, is the harmonic expression of them by way of excellence; and the result of the union of two contraries, light and darkness. There are, besides, agreeable tints, compounded of the oppositions of extremes. For example, of the second and fourth color, that is, of yellow and blue, is formed green, which constitutes a very beautiful harmony, and ought, perhaps, to possess the second rank in beauty, among colors, as it possesses the second in their generation. Nay, green appears to many, if not the most beautiful tint, at least the most lovely, because it is less dazzling than red, and more congenial to the eye."