All that we have said of yellow is applicable here in a higher degree. The red-yellow gives an impression of warmth and gladness, since it represents the hue of the intenser glow of fire, and of the milder radiance of the setting sun. Hence it is agreeable around us, and again, as clothing, in greater or less degrees is cheerful and magnificent. A slight tendency to red immediately gives a new character to yellow, and while the English and Germans content themselves with bright pale yellow colours in leather, the French, as Castel has remarked, prefer a yellow enhanced to red; indeed, in general, everything in colour is agreeable to them which belongs to the active side. YELLOW-RED. 774. As pure yellow passes very easily to red-yellow, so the deepening of this last to yellow-red is not to be arrested. The agreeable, cheerful sensation which red-yellow excites, increases to an intolerably powerful impression in bright yellow-red. 775, The active side is here in its highest energy, and it is not to be wondered at that impetuous, robust, uneducated men, should be especially pleased with this colour. Among savage nations the inclination for it has been universally remarked, and when children, left to themselves, begin to use tints, they never spare vermilion and minium. 776. In looking steadfastly at a perfectly yellow-red surface, the colour seems actually to penetrate the organ. It produces an extreme excitement, and still acts thus when somewhat darkened. A yellow-red cloth disturbs and enrages animals. I have known men of education to whom its effect was intolerable if they chanced to see a person dressed in a scarlet cloak on a grey, cloudy day. 777. The colours on the _minus_ side are blue, red-blue, and blue-red. They produce a restless, susceptible, anxious impression. BLUE. 778. As yellow is always accompanied with light, so it may be said that blue still brings a principle of darkness with it. 779. This colour has a peculiar and almost indescribable effect on the eye. As a hue it is powerful, but it is on the negative side, and in its highest purity is, as it were, a stimulating negation. Its appearance, then, is a kind of contradiction between excitement and repose. 780. As the upper sky and distant mountains appear blue, so a blue surface seems to retire from us. 781. But as we readily follow an agreeable object that flies from us, so we love to contemplate blue, not because it advances to us, but because it draws us after it. 782. Blue gives us an impression of cold, and thus, again, reminds us of shade. We have before spoken of its affinity with black. 783. Rooms which are hung with pure blue, appear in some degree larger, but at the same time empty and cold. 784. The appearance of objects seen through a blue glass is gloomy and melancholy. 785. When blue partakes in some degree of the _plus_ side, the effect is not disagreeable. Sea-green is rather a pleasing colour. RED-BLUE. 786.