35. A letter of Craterus to his mother Aristopatra is circulated, which contains many other singular circumstances, and differs from every other writer, particularly in saying that Alexander advanced as far as the Ganges. Craterus says, that he himself saw the river, and the whales[377] which it produces, and [his account] of its magnitude, breadth, and depth, far exceeds, rather than approximates, probability. For that the Ganges is the largest of known rivers in the three continents, it is generally agreed; next to this is the Indus; and, thirdly, the Danube; and, fourthly, the Nile. But different authors differ in their account of it, some assigning 30, others 3 stadia, as the least breadth. But Megasthenes says that its ordinary width is 100 stadia,[378] and its least depth twenty orguiæ.[379] 36. At the confluence of the Ganges and of another river (the Erannoboas[380]) is situated (the city) Palibothra, in length 80, and in breadth 15 stadia. It is in the shape of a parallelogram, surrounded by a wooden wall pierced with openings through which arrows may be discharged. In front is a ditch, which serves the purpose of defence and of a sewer for the city. The people in whose country the city is situated are the most distinguished of all the tribes, and are called Prasii. The king, besides his family name, has the surname of Palibothrus, as the king to whom Megasthenes was sent on an embassy had the name of Sandrocottus.[381] Such also is the custom among the Parthians; for all have the name Arsacæ,[382] although each has his peculiar name of Orodes, Phraates, or some other appellation. 37. All the country on the other side of the Hypanis is allowed to be very fertile, but we have no accurate knowledge of it. Either through ignorance or from its remote situation, everything relative to it is exaggerated or partakes of the wonderful. As, for example, the stories of myrmeces (or ants),[383] which dig up gold; of animals and men with peculiar shapes, and possessing extraordinary faculties; of the longevity of the Seres, whose lives exceed the age of two hundred years. They speak also of an aristocratical form of government, consisting of five hundred counsellors, each of whom furnishes the state with an elephant. According to Megasthenes, the largest tigers are found among the Prasii, almost twice the size of lions, and of such strength that a tame one led by four persons seized a mule by its hinder leg, overpowered it, and dragged it to him. The monkeys are larger than the largest dogs; they are of a white colour, except the face, which is black. The contrary is observed in other places. Their tails are more than two cubits in length. They are very tame, and not of a mischievous disposition. They neither attack people, nor steal. Stones are found there of the colour of frankincense, and sweeter than figs or honey.