The 49th gives light The 50th, chemical rays, vibrating 1, 125, 899, 906, 842, 624 per second.

The 51st to the 57th have never been touched by anyone save myself.

The X-ray group extends from the 58th to the 61st octave.

The 62d, with 4, 611, 686, 427, 889, 904 vibrations per second, is a field where only I have worked.

And beyond these, no doubt, other octaves extend with infinite possibilities.
"You will note, _monsieur_," he continued, while the dun penumbra still more and more withdrew him from Leclair's sight, "that great lacunae exist in the scale of vibratory phenomena.