Nearly everyone has had evidences of Mind Reading or Thought Transference in his or her own life. Nearly everyone has had experiences of being in a person's company when one of the two would make a remark and the other, some what startled, would exclaim, "Why, that's just what I was going to say," or words to that effect.
Science knows and has proven that thoughts may be and have been transmitted from one mind to another, in some cases over thousands of miles of space, but it has not as yet solved the mystery of the "Why" of the subject, and contents itself with explaining the "How.
The nearest approach to a correct theory seems to be the one which compares the mind with the "wireless telegraph," and which supposes that the vibrations of thought travel through the ether, just as do the waves of this high order of electricity. The mind of one person acts like a "transmitter" of the wireless telegraph, while the mind of the other acts as a "receiver" of the same set of instruments.