The Portuguese who visited Cazembe asked for slaves and ivory, and heard of nothing else.  I asked about the waters, questioned and cross-questioned, until I was almost afraid of being set down as afflicted with hydrocephalus.

My last work, in which I have been greatly hindered from want of suitable attendants, was following the central line of drainage down through the country of the cannibals, called Manyuema, or, shortly Manyema.  This line of drainage has four large lakes in it.  The fourth I was near when obliged to turn.  It is from one to three miles broad, and never can be reached at any point, or at any time of the year.  Two western drains, the Lufira, or Bartle Frere’s River, flow into it at Lake Kamolondo.  Then the great River Lomame flows through Lake Lincoln into it too, and seems to form the western arm of the Nile, on which Petherick traded.

Now, I knew about six hundred miles of the watershed, and unfortunately the seventh hundred is the most interesting of the whole; for in it, if I am not mistaken, four fountains arise from an earthen mound, and the last of the four becomes, at no great distance off, a large river.

Two of these run north to Egypt, Lufira and Lomame, and two run south into inner Ethiopia, as the Leambaye, or Upper Zambezi, and the Kaful.

Are not these the sources of the Nile mentioned by the Secretary of Minerva, in the city of Sais, to Herodotus?

I have heard of them so often, and at great distances off, that I cannot doubt their existence, and in spite of the sore longing for home that seizes me every time I think of my family, I wish to finish up by their rediscovery.

Five hundred pounds sterling worth of goods have again unaccountably been entrusted to slaves, and have been over a year on the way, instead of four months.  I must go where they lie at your expense, ere I can put the natural completion to my work.

And if my disclosures regarding the terrible Ujijian slavery should lead to the suppression of the East Coast slave trade, I shall regard that as a greater matter by far than the discovery of all the Nile sources together.  Now that you have done with domestic slavery for ever, lend us your powerful aid toward this great object.  This fine country is blighted, as with a curse from above, in order that the slavery privileges of the petty Sultan of Zanzibar may not be infringed, and the rights of the Crown of Portugal, which are mythical, should be kept in abeyance till some future time when Africa will become another India to Portuguese slave-traders.

I conclude by again thanking you most cordially for your great generosity, and am,

Gratefully yours,

David Livingstone.