On 15th April 1861, Baker and his wife left Cairo to make their way southward to join the quest for the source of the Nile. They reached Korosko in twenty-six days, and crossed the Nubian desert on camels, a "very wilderness of scorching sand, the simoon in full force and the thermometer in the shade standing at 114 degrees Fahr." By Abu Hamed and Berber they reached Atbara. It now occurred to Baker that without some knowledge of Arabic he could do little in the way of exploration, so for a whole year he stayed in northern Abyssinia, the country explored by Bruce nearly ninety years before. [Illustration: BAKER AND HIS WIFE CROSSING THE NUBIAN DESERT. From Baker's _Travels_.] It was therefore 18th December 1862 before he and Mrs. Baker left Khartum for their journey up the Nile through the slave-driven Sudan. It was a fifty days' voyage to Gondokoro. In the hope of finding Speke and Grant, he took an extra load of corn as well as twenty-two donkeys, four camels, and four horses. Gondokoro was reached just a fortnight before the two explorers returned from the south. Baker's account of the historical meeting between the white men in the heart of Africa is very interesting: "Heard guns firing in the distance--report that two white men had come from the sea. Could they be Speke and Grant? Off I ran and soon met them; hurrah for Old England. They had come from the Victoria Nyanza from which the Nile springs. The mystery of ages solved! With a heart beating with joy I took off my cap and gave a welcome hurrah as I ran towards them! For the moment they did not recognise me; ten years' growth of beard and moustache had worked a change, and my sudden appearance in the centre of Africa appeared to them incredible. As a good ship arrives in harbour battered and torn by a long and stormy voyage, so both these gallant travellers arrived in Gondokoro. Speke appeared to me the more worn of the two. He was excessively lean; he had walked the whole way from Zanzibar, never having ridden once during that wearying march. Grant was in rags, his bare knees projecting through the remnants of trousers." Baker was now inclined to think that his work was done, the source of the Nile discovered, but after looking at the map of their route, he saw that an important part of the Nile still remained undiscovered, and though there were dangers ahead he determined to go on his way into central Africa. "We took neither guide nor interpreter," he continues. "We commenced our desperate journey in darkness about an hour after sunset. I led the way, Mrs. Baker riding by my side and the British flag following close behind us as a guide for the caravan of heavily laden camels and donkeys. And thus we started on our march in central Africa on the 26th of March 1863."