Luminosity. — The impressionist is imbued with the fact that all the light by means of which things are at all visible is luminous — that it vibrates. He does not think that living light can be represented by dead color. He strives to make his color live also. This is the secret of the purple and yellow. By the contrast of these two colors, by the combination and contrast and juxtaposition of the complementary colors and the use of pure pigments, he can make his colors more vibrant, and so give more of the pitch of real sunlight. He actually applies on his canvas the laws which are known to hold with light and color scientifically. He applies practically in his work those laws which the scientist furnishes him with [325] theoretically. The result in some hands is garish, crude. But the best men have shown that it is possible to use the means so as make a subtle harmony and a luminous brilliancy that have never before been attained. The crudity is the result of the man, not of the method.

The Application. — The application of all this to your own work is that when you want pitch and sunlight you can get it through the observance of the laws of color contrast, and such a laying on of pigment as will bring this about. Try to study thé actual contrasts of color, not as they seem, but as they are in nature. Study the facts which have been observed as to colors in their effects on each other, and then try to see these in nature and to paint the results.

The Luminists. — This is the principle of all “loose painting” carried out scientifically. It is the cause of the peculiar technique of those impressionists who paint in streaks and spots of pigment. The manner of putting on paint does interfere with the continuity of outline in the drawing necessarily, but there is a marked gain in the quality of light; and as these men are “luminists,” and light is what they want primarily, the sacrifice is justifiable, or at any rate explicable.

Now if you understand the scientific principle, and the practical application and its result on canvas, you have in your hands one of the main [326]

instrumentalities in the rendering of one great quality of out-of-doors. How far you adopt it is a matter for you to decide for yourself. If the complete adoption of it implies too much of a sacrifice of other things of equal or greater value to you, then modify it, or take advantage of it as much as will give you the balance of qualities you most want. There is one way to get light and brilliancy and life into your color: adapt it to your purpose if you need it.

This is the application of color juxtaposition to mixing. The placing of complementaries so as to increase contrast is another way of adding to the brilliancy of light. You will find this most useful when you want to give the greatest possible emphasis to the effect of sunlight and shadow. If you keep your shadows cool, your lights will be the richer and more sparkling because of that contrast. If you want more strength in a note of color, get its complement as near it as you can. Look for their iridescence of edges of shadow, and of the contours of objects. You will get greater relief of light and shade by contrast of warm and cool than contrast of light and dark.

Do not misunderstand me. I am not advising you to be an impressionist. I wish only that you shall see what there is in this way of looking at nature and of representation of certain effects of nature, which will be of use to you in the painting [327] of landscape. I would have you know what means are at your command, what is possible to accomplish in certain directions, and how it is possible to accomplish it; then I would have you make use of whatever will most directly and completely serve your purpose.

Do not use any color or colors, any method or point of view, because of any advocacy whatsoever. Know first what you want to paint and why. Let nature speak to you. Go out and look at landscape. Study and observe; see the effect which makes you want to paint it, and then use the means and method which seem most entirely adapted to it. Don't ask yourself, nor let any one else ask you, Is this So-and-So's method? or, Does this belong to this or that school? Don't bother about schools or methods at all. Look frankly to see, accept frankly, and then work to render and convey as frankly as you have seen. Be sincere — sincere with yourself and with your painting: then you will surely work at whatever you do from conviction, and not from fad; and whether it makes you paint as an impressionist or not is a very minor matter, because sincerity of purpose is the most important thing in painting, and method of representation one of the least.

Atmosphere. — A universal characteristic of nature will be a fundamental one in landscape. A landscape which you cannot breathe in is not a [328] perfect one. We live and breathe in atmosphere, and the expression of atmosphere will go far to make your landscape true. But atmosphere is not haziness. Neither is it vagueness nor negativeness of color. Truth of color-quality, and justness of relation will do most in getting it. You had better not try for atmosphere as a thing, but as a result. Anything so universal and so indefinite can be expressed by no one thing. If you try to get it by any one means you will miss it. Study, then, the subtlety of color relation and justness of value. Try to be sensitive to the slightest variety of tone, and be satisfied with no least falsity of rendering, and you will find that your picture will not lack atmosphere.

Color of Contour. — An important thing for you to look for and to study is the color of contours. You will not find it easy; not easy even to know what it is that you are looking for. But consider it as a combination of contiguous values and color vibrations, and things will reveal themselves to you.

No form is composed of unvarying color. No combination of color surrounding it lacks variety. All along the edge of forms and objects, of whatever kind, the value and color relation constantly change. The outline is not constant. Here and there it becomes lost from identity of value and color with what surrounds it, and again defines itself. The edge is not sharp. The color rays [329] vibrate across each other. The inevitable variety of tint and value, of definiteness and vagueness, gives a never-ending play of contrasts and blend-ings. These are qualities which go to the harmonizing of color, to the expression of light, and particularly to the feeling of atmosphere. This constant variety of contrasting edges is the constant movement and play of the visual rays, and the study of it gives life and vibration to the picture, and all the objects represented in it.

Outdoors, particularly when the play of diffused light and the movement of all the objects is continually felt, either through their own elasticity or because of the heat and light waves, this study is most necessary, if you would get the feeling of freedom, space, and air.

Skies. — In the painting of the sky there are several points to be kept in mind. The sky, even on the quietest day, is full of movement. Cloud masses change continually. If there are no clouds there is constant vibration in the blue; constant variety in the plane of color, — a throb of color sensation which is not to be expressed by a dead, flat tint.

Paint the sky loosely. Lay on the color as you will, with a broad, flat brush, or with a loose, smudgy handling; put it on with horizontal strokes, or with criss-cross touches, but never make it a lifeless tone. Have variety in it; keep a pulsation [330] between the warm and cool color. You can work in the separate touches of half-mixed color, warm and cool, all through the sky, so that the whole tone will be flat and even, but not dense and dead. So far as the sky is concerned, the atmosphere is essential, and is to be represented not by dense color, but by free, loose, vibrating color.

Clouds. — If you have clouds to paint, do not draw them rigidly. Get the effect of the mass and movement, and the lightness of them. As they constantly change in form, any one form they may assume cannot be characteristic. The type form is what you must get, and the suggestion of the motion and lightness. You can suggest, too, the direction of the wind by the way they mass and sway and flow. The direction of the sun's rays, too, counts in the color of them. The outline of a cloud mass is never hard, never rigid. The pitch and luminosity and subtlety are what give you most of the effect of it.

Study the type of cloud, of course. It is a cumulus, cirrus, stratus, or what not. This character is important; but the character lies in the whole body of the cloud form, not in the accidental outlines or the special position of it for the moment.

Sky Composition. — The massing of cloud forms is a very useful factor in the composition of the landscape. The cloud bank or cloud line is capable of giving accent or balance to the picture. [331]

As it is not constant in position any more than in form, you can place it with truth to nature pretty nearly always where it will do the most good as an element in the composition. Make use of them, then, and study the forms and the possible phases of them so as to make the best use of them.

Diffused Light. — Much of the characteristic quality of out-door light is the result of the diffusion of light due to both the refraction and the reflection of the sky. The light which bathes the landscape comes in all directions from the sky. Necessarily, then, the sky will be in most cases far higher in value than anything under it. Even the blue of the sky, which looks darker than some bit of light in the landscape, you will find, if you can manage to get them to tell against each other, will be the more luminous of the two, and will look lighter. There are times when the sun glares on a white building or a piece of white sand, when the white tells light against the blue. But these are exceptions, and if we could get a blue paint which would give the intensity of color, and also the brilliancy of the light, even these cases would be most truly represented with the sky as the higher value. It is a case of whether to sacrifice value to color, or the reverse, as we cannot have both.

Sometimes, however, in a storm, the dense dark [332] of the storm sky is really lower in value than some white object against it, especially if there be a bit of sun breaking through on it.

But in general, nevertheless, you should consider the sky as always lighter and more luminous than anything under it.