We reached Berber on May 31st, and spent a week in resting after our formidable desert march of fifteen days. From the slight experience I had gained in the journey, I felt convinced that success in my Nile expedition would be impossible without a knowledge of Arabic. My dragoman had me completely in his power, and I resolved to become independent of all interpreters as soon as possible. I therefore arranged a plan of exploration for the first year, to embrace the affluents to the Nile from the Abyssinian range of mountains, intending to follow up the Atbara River from its junction with the Nile in latitude 17 deg. 37 min. (twenty miles south of Berber), and to examine all the Nile tributaries from the southeast as far as the Blue Nile, which river I hoped ultimately to descend to Khartoum. I imagined that twelve months would be sufficient to complete such an exploration, by which time I should have gained a sufficient knowledge of the Arabic to render me able to converse fairly well.