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
John Hanning Speke it was vast and they only could get small canoes from the locals. Burton was too ill to journey and thus Speke crossed the lake with a small crew and some canoes to try to rent a larger vessel from an Arab who, they were told, had a large boat and lived on the west side of the lake. (Lake Tanganyika is over 400 miles long on the north-south axis but only about 30 miles wide.) During this trip Speke, marooned on an island, suffered severely when he became temporarily deaf after a beetle crawled into his ear and he