"There is much food for speculation in the thought that there exists sound waves that no human ear can hear, and color waves of light that no eye can see. The long, dark, soundless space between 40,000 and 400,000,000,000,000 vibrations per second, and the infinity of range beyond 700,000,000,000,000 vibrations per second, where light ceases, in the universe of motion, makes it possible to indulge in speculation."

M. M. Williams, in his work entitled "Short Chapters in Sciences," says, "There is no gradation between the most rapid undulations or tremblings that produce our sensation of sound, and the slowest of those which give rise to our sensations of gentlest warmth. There is a huge gap between them, wide enough to include another world of motion, all lying between our world of sound and our world of heat and light, and there is no good reason whatsoever for supposing that matter is incapable of such intermediate activity, or that such activity may not give rise to intermediate sensations, provided there are organs for taking up and sensifying these movements."

I cite the above authorities merely to give you food for thought, not to attempt to demonstrate to you the fact that thought vibrations exist. The last mentioned subject would be far beyond the scope and purposes of this work, and can only be touched upon herein.

The character of the thought vibrations sent out by us depends upon the nature of the thought itself. If thought had color (and some say that they have), we should see our fear and worry thought as murky, heavy, clouds hanging close to the earth; our bright, cheerful and happy, confident, "I can and I will' thought as light, fleecy, vapory clouds hanging close to the earth; our bright, cheerful and happy, confident, "I can and I Will" thoughts as light, fleecy, vapory clouds, traveling swiftly and mingling with others of their kind, forming fleecy cloud banks, high above the level of the dense, mephitic, foul exhalations produced by fear and worry "I can't" thoughts.