In all of Nature's wonderful processes we find many evidences of that great principle of Action and Reaction, which, like the forward and backward swing of the pendulum, changes cause into effect, and effect into cause, in a never ending series. We find this principle in effect in the psychic relation of mental states and colors. That is to say, that just as we find that certain mental and emotional states manifest in vibrations causing particular auric astral colors, so do we find that the presence of certain colors on the physical plane will have a decided psychic effect upon the mental and emotional states of individuals subject to their influence. And, as might be expected by the thoughtful student, the particular astral colors manifested in the aura by the presence of some particular mental or emotional state exactly correspond with the particular physical colors which influence that particular mental or emotional state. Illustrating the statements in the preceding paragraph, I would say that the continued presence of red will be apt to set up emotional vibrations of anger, passion, physical love, etc., or, in a different tint, the higher physical emotions. Blue, of the right tint, will tend to cause feelings of spirituality, religious emotion, etc. Green is conducive to feelings of relaxation, repose, quiet, etc. Black produces the feeling of gloom and grief. And so on, each color tends to produce emotional vibrations similar to those which manifest that particular color in the astral aura of the person. It is a case of "give and take" along the entire scale of color and emotions, according to the great natural laws. While the explanation of these facts is not known to the average person, nevertheless nearly everyone recognizes the subtle effect of color and avoids certain colors, while seeking certain others. There is not a single living human being but who has experienced the sense of rest, calm, repose, and calm inflow of strength, when in a room decorated in quiet shades of green. Nature, herself, has given this particular shade to the grass and leaves of trees and plants, so that the soothing effect of the country scene is produced. The aura of a person experiencing these feelings, and yielding to them, will manifest precisely the tint or shade of green which is shown on the grass and leaves around him, so true is this natural law of action and reaction. The effect of scarlet upon animals, the bull for instance, is well known--to use the familiar term, it causes one to "see red." The sight of the color of blood is apt to arouse feelings of rage, or disgust, by reason of the same law. The sight of the beautiful clear blue sky tends to arouse feelings of reverence, awe or spirituality. One can never think of this shade of blue arousing rage; or red arouse feelings of spirituality.