The men being paid in slaves, the wages should be NIL, and there should be a surplus of four or five hundred slaves for the trader's own profit--worth on an average five to six pounds each.
The amiable trader returns from the White Nile to Khartoum; hands over to his creditor sufficient ivory to liquidate the original loan of 1,000 pounds, and, already a man of capital, he commences as an independent trader.
Such was the White Nile trade when I prepared to start from Khartoum on my expedition to the Nile sources.

Every one in Khartoum, with the exception of a few Europeans, was in favor of the slave-trade, and looked with jealous eyes upon a stranger venturing within the precincts of their holy land--a land sacred to slavery and to every abomination and villainy that man can commit.
The Turkish officials pretended to discountenance slavery; at the same time every house in Khartoum was full of slaves, and the Egyptian officers had been in the habit of receiving a portion of their pay in slaves, precisely as the men employed on the White Nile were paid by their employers.

The Egyptian authorities looked upon the exploration of the White Nile by a European traveller as an infringement of the slave territory that resulted from espionage, and every obstacle was thrown in my way.
To organize an enterprise so difficult that it had hitherto defeated the whole world, required a careful selection of attendants, and I looked with despair at the prospect before me.

The only men procurable for escort were the miserable cut-throats of Khartoum, accustomed to murder and pillage in the White Nile trade, and excited not by the love of adventure, but by the desire for plunder.

To start with such men appeared mere insanity.
There was a still greater difficulty in connection with the White Nile.
For years the infernal traffic in slaves and its attendant horrors had existed like a pestilence in the negro countries, and had so exasperated the tribes that people who in former times were friendly had become hostile to all comers.