These two adventurous travellers were a wealthy and eccentric Englishman, named Louis Holt, and Thomas Jackson, his devoted retainer, and these two had taken it into their heads--or rather Louis Holt had taken it into his head--to achieve in fact the feat which Jules Verne had so graphically described in fiction, and to cross Africa in a balloon.
They had set out from Zanzibar towards the end of the last year of the nineteenth century, and, with the exception of one or two vague reports from the interior, nothing more had been heard of them until, nearly a year later, a collapsed miniature balloon had been picked up in the Gulf of Guinea by the captain of a trading steamer, who had found in the little car attached to it a hermetically sealed meat-tin, which contained a manuscript, the contents of which will become apparent in due course.
The captain of the steamer was a practical and somewhat stupid man, who read the manuscript with considerable scepticism, and then put it away, having come to the conclusion that it was no business of his, and that there was no money in it anyhow. He thought nothing more of it until he got back to Liverpool, and then he gave it to a friend of his, who was a Fellow of the Royal Geographical Society, and who duly laid it before that body.
It was published in the _Transactions_, and there was some talk of sending out an expedition under the command of an eminent explorer to rescue Louis Holt and his servant; but when that personage was approached on the subject, it was found that the glory would not be at all commensurate with the expense and risk, and so, after being the usual nine days' wonder, and being duly elaborated by several able editors in the daily and weekly press, the strange adventures of Louis Holt had been dismissed, as of doubtful authenticity, into the limbo of exhausted sensations.
One man, however, had laid the story to heart somewhat more seriously, and that was Richard Arnold, who, on reading it, had formed the resolve that, if ever his dream of aërial navigation were realised, the first use he would make of his air-ship would be to discover and rescue the lonely travellers who were isolated from the rest of the world in the strange, inaccessible region of which the manuscript had given a brief but graphic and fascinating account. He was now carrying out that resolve, and at the same time working out a portion of a plan that was not his own, and which he had been very far from foreseeing when he made the resolution.