Dr. Albert Peney was to have been medical officer to the expedition. When it was dissolved, he started off for the White Nile on his own account, attaching himself, whenever opportunity offered, to such caravans as those of Andrea de Bono, the Maltese. Peney made a remarkably good map (most interesting to place on record as showing subsequent changes in the course of the Nile) between Bor and a place which he calls Nieki, which was situated on the Mountain Nile very near to the present site of Fort Berkeley. Peney, hearing rumours of great rivers to the west, crossed the range of hills which flanks the western bank of the Mountain Nile in the Bari country, and thus reached the river Yie or Yeï. This river, as we know now, flows northwest nearly parallel to the main Mountain Nile, and joins that river some distance before its junction with the Bahr-al-Ghazal. But Peney exaggerated the importance of this stream, and confused it with the accounts he heard of the many great rivers that united to form the Bahr-al-Ghazal. On his map he actually makes the Yie an effluent of the White Nile, issuing from the main stream not far from the present post of Nimule, and flowing northwestwards until it enters the Bahr-al-Ghazal. He thus transformed the whole region of the Bahr-al-Ghazal into an enormous island encircled by two branches of the Nile. Peney further visited the country to the east of Gondokoro, and was probably the first explorer to mention the name Latuka. This country he rightly designates Lotuka. Latuka is the incorrect version given to the world by Emin Pasha. The _Lo_ in this word is really the masculine article met with in so many of the Masai group of languages to which the tongue of Latuka belongs. The root _tuka_ (which should be properly spelled and pronounced _tukă_) is evidently a racial name widespread among that Negroid group resulting from an ancient intermixture of the Gala with the Negro, from which groups the Latuka, Turkana, Masai, Nandi, and Elgumi descend.[44] Dr. Peney died of blackwater fever in July, 1861, at a point on the Nile near Fort Berkeley. Andrea de Bono was with him at his death, and records the characteristics of the disease from which Dr. Peney died. Since the idea has been started that blackwater fever is quite a new disease in these regions, it is interesting to know that from all accounts several of the earliest European pioneers from 1848 to 1861 appear to have died of this malady whilst exploring the Upper Nile. About the time that Peney was exploring the Mountain Nile, another Frenchman, Lejean, was surveying with some correctness the Bahr-al-Ghazal estuary, of which he published a map in 1862. [Illustration: MAP PUBLISHED IN PENNY MAGAZINE OF 1852. Which gives results of Nile exploration up to that date.]