The Harvys or Psylles of Egypt impart to the ringed snake the appearance of a stick by pressure on the head, which induces a species of tetanus, says E. W. Lane. The following description of serpent charming by the Aissouans of the province of Sous, Morocco, will be of interest: “The principal charmer began by whirling with astonishing rapidity in a kind of frenzied dance around the wicker basket that contained the serpents, which were covered by a goatskin. Suddenly he stopped, plunged his naked arm into the basket, and drew out a cobra de capello, or else a haje, a fearful reptile which is able to swell its head by spreading out the scales which cover it, and which is thought to be Cleopatra’s asp, the serpent of Egypt. In Morocco it is known as the buska. The charmer folded and unfolded the greenish-black viper, as if it were a piece of muslin; he rolled it like a turban round his head, and continued his dance while the serpent maintained its position, and seemed to follow every movement and wish of the dancer. “The buska was then placed on the ground, and raising itself straight on end, in the attitude it assumes on desert roads to attract travelers, began to sway from right to left, following the rhythm of the music. The Aissoua, whirling more and more rapidly in constantly narrowing circles, plunged his hand once more into the basket, and pulled out two of the most venomous reptiles of the desert of Sous; serpents thicker than a man’s arm, two or three feet long, whose shining scales are spotted black or yellow, and whose bite sends, as it were, a burning fire through the veins. This reptile is probably the torrida dipsas of antiquity. Europeans now call it the leffah. “The two leffahs, more vigorous and less docile than the buska, lay half curled up, their heads on one side, ready to dart forward, and followed with glittering eyes the movements of the dancer. * * * Hindoo charmers are still more wonderful; they juggle with a dozen different species of reptiles at the same time, making them come and go, leap, dance, and lie down at the sound of the charmer’s whistle, like the gentlest of tame animals. These serpents have never been known to bite their charmers.” It is well known that some animals, like the opossum, feign death when caught. Whether this is to be compared to hypnotism is doubtful. Other animals, called hibernating, sleep for months with no other food than their fat, but this, again, can hardly be called hypnotism. CHAPTER XI. A Scientific Explanation of Hypnotism.—Dr. Hart’s Theory. In the introduction to this book the reader will find a summary of the theories of hypnotism. There is no doubt that hypnotism is a complex state which cannot be explained in an offhand way in a sentence or two. There are, however, certain aspects of hypnotism which we may suppose sufficiently explained by certain scientific writers on the subject.