“In accordance with that definite property of the ‘common integral vibration,’ or the ‘white ray,’ during the process of its transformations about which I have just spoken and which was already familiar to the learned Babylonian painters, each of its ‘center-of-gravity vibrations’ or one of the separate colors of the ‘white ray’ always ensues from another and is transformed into a third, for example, the color orange is obtained from red, and in turn passes into yellow, and so on and so forth.”