The two most likely objections advanced against this conception by sceptical critics are as follows: "(1) The mental vibratory motion, or vibratory waves, are not known to science, nor recorded on scientific instruments such as the galvanometer. What is the rate of such vibrations, and what is their general character? (2) Granted the existence of such vibratory energy, or thought-waves, how and by means of what channel does the second person receive them from the first person? How are they registered or recorded?" These objections are capable of being met in a scientific manner, to the satisfaction of any fair-minded critic or investigator. We shall now give you, briefly, the gist of the answer of science to the aforesaid objections. The World of Vibrations It is true that the scientific instruments of the laboratory, such as the galvanometer, do not record thought vibrations. This, because such instruments are capable of registering and recording on certain rates and modes of vibratory energy. Thought vibrations are registered only by their appropriate instruments, namely, the Chitta of Mind substance of living persons. As to the "general character and rate of vibration" of these waves of mental force, we can only say that their general character is that of "mental force" as opposed to "physical force." As to their rate of vibration, we can only say that this is not precisely known, not having as yet been definitely ascertained; but it should be added that THERE IS PLENTY ROOM FOR THESE VIBRATIONS in the great field of vibratory energy. Read the following paragraphs, and decide this last matter for yourself. Uncharted Seas of Vibration. The following quotations from eminent scientists will serve to give the student a general idea of the views of science upon the question of the possibility of the existence and presence of vibratory energy of kinds and characters as yet unknown to science: The first scientist says: "There is much food for speculation in the thought that there exists sound waves that no human ear can hear, and color waves 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." The second scientist says: "There is no gradation between the most rapid undulations or tremblings that produce our sensation of sound, and the lowest 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 whatever for supposing that matter is incapable of such intermediate activity, or that such activity may not give rise to intermediate sensations, provided that there are organs for taking up and sensifying these movements."