Page:The Philosophy of Creation.djvu/234

 man looking out upon nature does not see it as a profound mystery, for to him "The heavens declare the glory of God, and the firmament showeth His handiwork."

Radiation of heat or of light is the communication of activity from the substances of which heat or light is predicated to other substances.

Bodies are conductors or non-conductors according to their ability to take up and to transmit modes of motion; and transparent or opaque respectively as they transmit or are impervious to the ethereal motion from which is light.

Color is due to the modifications of the influent rays of light, which is according to the contexture of the reflecting object, the reflected rays being thereby modified, and producing variation in color according to the laws of light and sight.

It is necessary to introduce here only a brief and general idea of space, and consequently of time.