In the theory of vibratory forces, as set forth in the earlier chapters of this book, we have the only scientific explanation of the phenomena of distant clairvoyance. Modern science, in its teachings regarding the radio-activity of physical objects, has thrown much additional light on this subject, and has corroborated the ancient occult teachings on the subject. These rays of higher vibratory power are like the rays of light or heat, although of a much higher rate of intensity and vibratory motion, and though the most delicate scientific instruments are able to register some of these, it is still practically admitted by science that the highest of these radio-active vibrations are beyond the scope and field of even the most sensitive instrument yet known to science. This is saying much when we remember that some of the delicate instruments of science are so sensitive that they are able to register the heat waves of a candle at the distance of one mile; while others are able to record the presence of certain chemical elements in the most distant of the visible stars, by means of the light waves carrying certain forms of vibration. Sensing the Higher Vibrations. Under the radio-active theory it is quite reasonable to conceive of the clairvoyant sense being able to register and interpreting these higher vibrations which are beyond the power of even the most delicate instruments of science. It must be admitted that the existence of such vibrations being granted--and science tacitly admits their presence--then ordinary distances on earth would be no barrier at all to the action of clairvoyant vision capable of registering them. Moreover, in such case all intervening objects would be penetrated by these waves, and as a writer has well said, "they would be able to cross one another to infinity in all directions without entanglement, precisely as the vibrations of ordinary light do." Physical science and psychic science at last seem to have arrived at a common ground of understanding, and many of the most advanced scientists do not hesitate to admit this fact, though their more conservative brethren hesitate to do so. Viewing Distant Scenes.