However, all these are physical phenomena produced by Hatha-Yogis. Each of them ought to be investigated by physical science, but they are much less interesting than the phenomena of the region of psychology. But Dr. Paul has next to nothing to say on this subject. During the thirty-five years of his Indian career, he met only three Raj-Yogis; but in spite of the friendliness they showed to the English doctor, none of them consented to initiate him into the mysteries of nature, a knowledge of which is ascribed to them. One of them simply denied that he had any power at all; the other did not deny, and even showed Dr. Paul some very wonderful things, but refused to give any explanations whatever; the third said he would explain a few things on the condition that Dr. Paul must pledge himself never to repeat anything he learned from him. In acquiring this kind of information, Dr. Paul had only one aim--to give these secrets publicity, and to enlighten the public ignorance, and so he declined the honor. However, the gifts of the true Raj-Yogis are much more interesting, and a great deal more important for the world, than the phenomena of the lay Hatha-Yogis. These gifts are purely psychic: to the knowledge of the Hatha-Yogis the Raj-Yogis add the whole scale of mental phenomena. Sacred books ascribe to them the following gifts: foreseeing future events; understanding of all languages; the healing of all diseases; the art of reading other people's thoughts; witnessing at will everything that happens thousands of miles from them; understanding the language of animals and birds; Prakamya, or the power of keeping up youthful appearance during incredible periods of time; the power of abandoning their own bodies and entering other people's frames; Vashitva, or the gift to kill, and to tame wild animals with their eyes; and, lastly, the mesmeric power to subjugate any one, and to force any one to obey the unexpressed orders of the Raj-Yogi. Dr. Paul has witnessed the few phenomena of Hatha-Yoga already described; there are many others about which he has heard, and which he neither believes nor disbelieves. But he guarantees that a Yogi can suspend his breath for forty-three minutes and twelve seconds. Nevertheless, European scientific authorities maintain that no one can suspend the breath for more than two minutes. O science! Is it possible then that thy name is also vanitas vanitatum, like the other things of this world? We are forced to suppose that, in Europe, nothing is known about the means which enabled the philosophers of India, from times immemorial, gradually to transform their human frames.