John Hanning Speke questions about the height and extent of the lake could not be answered easily. Speke's eyes were still bothering him and he only saw a small part of the southern end of the lake and his view was blocked by islands in the lake so he could not judge the size of the lake well. However, Speke did estimate the elevation of Lake Victoria at 4000 feet by observing the temperature at which water boiled at that level. (This lake's being substantially higher than Lake Tanganyika did make it a more likely candidate for the source of the Nile.) From
Travels to Discover the Source of the Nile Travels to Discover the Source of the Nile Travels to Discover the Source of the Nile, In the Years 1768, 1769, 1770, 1771, 1772 and 1773 is a multi-volume account by the Scottish traveller James Bruce (1730–94) of his journeys in the Horn of Africa, which includes an eye-witness account of Ethiopian history and culture, as well as a description of that country and the neighboring kingdom of Sennar and the Ottoman province of Habesh. Bruce and his sensational stories were received with incredulity upon his return to London in 1774 after more than a dozen years of travel in