We anchored for the night off the south side of the Zungá chyá Ngombe, in Portuguese Ilha do Boi (Bullock), the Rhinoceros Island of our early charts. It emerges from the waters of the right bank, a mere "ponton" plumed with dark mangroves and streaked with spar-like white trunks. This is probably the "Island of Horses," where the Portuguese, flying from the victorious Hollanders, were lodged and fed by the courteous Count of Sonho; perhaps it is Battel's "Isle Calabes." The place is backed by the Monpanga or Mombang, the "Look-out Islands" of the chart, which has greatly changed since the beginning of the century; the dark mass of mangroves is now apparently part of the northern shore. Almost due south of the Ilha do Boi is the Zungá chyá Kampenzi, whence our word chimpanzee: in the hydrographic chart it is miswritten Zoonga Campendi, and in Tuckey's map, which contradicts his text, "Zoonga Casaquoisa." His "Zoonga Kampenzey," also named "Halcyon Island," appears to be the Draper's Island or the "Monkey Island" of Mr. Maxwell: the latter in modern charts is more to the north-east, that is, above Porto da Lenha, than the former. The Simiads have been killed out; Captain Tuckey going up the river saw upwards of twenty which, but for their tails, might have been mistaken for negroes. Merolla says that wild men and women (gorillas?) have been captured in Sonho, and he carefully distinguishes them from baboons: one of them was presented to a friar of his order, who "bestowed it on the Portuguese governor of Loanda." Chimpanzee Island may be the Zariacacongo of Father Merolla, who makes Cacongo (Great Congo) a large and independent kingdom" lying in the middle between Congo and Loango." He describes Zariacacongo, "none of the smallest, and situate in the midst of the River Zaire." It abounded in all sorts of provisions, was well peopled, consisted of a plain raised eight fathoms above water, and was divided from the kingdom of Congo by a river, over which there was a bridge.