At the same time, I have no hesitation in saying that ten times as much merchandise might be got at less expense, if the trade were protected by government means, and put on a legitimate footing. Those countries teem with cattle. The indigenous cotton is of very superior quality. Indigo, sugar-cane, coffee, tobacco, sesamum, and indeed all things that will grow in a tropical climate, may be grown there within 3° of the equator, in luxurious profusion, and without any chance of failure owing to those long periodical droughts which affect all lands distant more than 3° from the equator. When I was sailing down the Nile, I could not help remarking to all the pashas I visited how strange it appeared that men so civilised as they were should be living in such a barren, hot, and glaring land as Egypt, when the negroes on the equator were absolutely living in the richest and pleasantest garden in the world, so far as nature has made the two countries. Now, though I have dwelt so markedly on the surprising fertility of Uganda and Unyoro in particular, I do not wish it to be supposed that I consider those countries alone to be exclusively rich, for I believe there is a continuous zone of fertility stretching right across Africa from east to west, affected only by the nature of the soil. In advancing this argument, I hold that the greatest discovery I have made in Africa consists in my positive knowledge regarding the rainy system of Africa; and to exemplify it irrespectively of my meteorological observations, I will state emphatically that as surely as I have determined the source of the Nile to lie within 3° of the equator, and that it cannot emanate from any point farther south, because all the lands beyond that limit are subject to long periodical droughts--so certain am I that the Tanganyika is supplied from the same source, or rainy zone, though draining in the opposite direction. Again, to its west also, from the same source of supply, the head-waters of the Zambézi take their origin. Still farther west, the fountains of the Congo must have their birth. Again, farther west still, the Chadda branch of the Niger can alone be thus supplied, and the same must be the case with the Gaboon river. To carry this argument still farther, I would direct attention to the periodical conditions of the Blue Nile and Niger rivers. Both of these rivers rise in high mountains on the coast-range, at about 10° north latitude, but on opposite sides of the continent. They are considered large rivers, but only in consequence of their great floodings, when the sun, in his northern declination, brings the rains over the seats of their birthplaces; for when the sun is in the south they shrink so low that the waters of the Blue river would never have power to reach the sea were they not assisted by the perennial stream of the White Nile.