They set sail again, and Hanno reached the mouth of the river Chretes, which forms a sort of natural harbour, but as they endeavoured to explore this river, they were assailed with showers of stones from the native negro race, inhabiting the surrounding country, and driven back, and after this inhospitable reception they returned to Cerne. We must not omit to add that Hanno mentions finding large numbers of crocodiles and hippopotami in this river. Twelve days after this unsuccessful expedition, the fleet reached a mountainous region, where fragrant trees and shrubs abounded, and it then entered a vast gulf which terminated in a plain. This region appeared quite calm during the day, but after nightfall it was illumined by tongues of flame, which might have proceeded from fires lighted by the natives, or from the natural ignition of the dry grass when the rainy season was over. In five days, Hanno doubled the Cape, known as the Hespera Keras, there, according to his own account, "he heard the sound of fifes, cymbals, and tambourines, and the clamour of a multitude of people." The soothsayers, who accompanied the party of Carthaginian explorers, counselled flight from this land of terrors, and, in obedience to their advice, they set sail again, still taking a southerly course. They arrived at a cape, which, stretching southwards, formed a gulf, called Notu Keras, and, according to M. D'Avezac, this gulf must have been the mouth of the river Ouro, which falls into the Atlantic almost within the Tropic of Cancer. At the lower end of this gulf, they found an island inhabited by a vast number of gorillas, which the Carthaginians mistook for hairy savages. They contrived to get possession of three female gorillas, but were obliged to kill them on account of their great ferocity. This Notu Keras must have been the extreme limit reached by the Carthaginian explorers, and though some historians incline to the belief that they only went to Bojador, which is two degrees North of the tropics, it is more probable that the former account is the true one, and that Hanno, finding himself short of provisions, returned northwards to Carthage, where he had the account of his voyage engraved in the temple of Baal Moloch. After Hanno, the most illustrious of ancient travellers, was Herodotus, who has been called the "Father of History," and who was the nephew of the poet Panyasis, whose poems ranked with those of Homer and Hesiod. It will serve our purpose better if we only speak of Herodotus as a traveller, not an historian, as we wish to follow him so far as possible through the countries that he traversed.