Concerning the word Patala, which literally means the opposite side, a recent discovery of Swami Dayanand Saraswati, whom I have already mentioned in the preceding letters, is interesting, especially if this discovery can be accepted by philologists, as the facts seem to promise. Dayanand tries to show that the ancient Aryans knew, and even visited, America, which in ancient MSS. is called Patala, and out of which popular fancy constructed, in the course of time, something like the Greek Hades. He supports his theory by many quotations from the oldest MSS., especially from the legends about Krishna and his favourite disciple Arjuna. In the history of the latter it is mentioned that Arjuna, one of the five Pandavas, descendants of the moon dynasty, visited Patala on his travels, and there married the widowed daughter of King Nagual, called Illupl. Comparing the names of father and daughter we reach the following considerations, which speak strongly in favour of Dayanand's supposition. (1) Nagual is the name by which the sorcerers of Mexico, Indians and aborigines of America, are still designated. Like the Assyrian and Chaldean Nargals, chiefs of the Magi, the Mexican Nagual unites in his person the functions of priest and of sorcerer, being served in the latter capacity by a demon in the shape of some animal, generally a snake or a crocodile. These Naguals are thought to be the descendants of Nagua, the king of the snakes. Abbe Brasseur de Bourbourg devotes a considerable amount of space to them in his book about Mexico, and says that the Naguals are servants of the evil one, who, in his turn, renders them but a temporary service. In Sanskrit, likewise, snake is Naga, and the "King of the Nagas" plays an important part in the history of Buddha; and in the Puranas there exists a tradition that it was Arjuna who introduced snake worship into Patala. The coincidence, and the identity of the names are so striking that our scientists really ought to pay some attention to them.