But, after all, my friend, we are going to keep at about one hundred feet only from the soil, and, should you see any ferocious wild beast, oblige us by sending a ball through its heart!"
The Victoria descended gradually, but still keeping at a safe height, for, in a barbarous, yet very populous country, it was necessary to keep on the watch for unexpected perils.
The travellers were then directly following the course of the Shari. The charming banks of this river were hidden beneath the foliage of trees of various dyes; lianas and climbing plants wound in and out on all sides and formed the most curious combinations of color. Crocodiles were seen basking in the broad blaze of the sun or plunging beneath the waters with the agility of lizards, and in their gambols they sported about among the many green islands that intercept the current of the stream.
It was thus, in the midst of rich and verdant landscapes that our travellers passed over the district of Maffatay, and about nine o'clock in the morning reached the southern shore of Lake Tchad.
There it was at last, outstretched before them, that Caspian Sea of Africa, the existence of which was so long consigned to the realms of fable--that interior expanse of water to which only Denham's and Barth's expeditions had been able to force their way.
The doctor strove in vain to fix its precise configuration upon paper. It had already changed greatly since 1847. In fact, the chart of Lake Tchad is very difficult to trace with exactitude, for it is surrounded by muddy and almost impassable morasses, in which Barth thought that he was doomed to perish. From year to year these marshes, covered with reeds and papyrus fifteen feet high, become the lake itself. Frequently, too, the villages on its shores are half submerged, as was the case with Ngornou in 1856, and now the hippopotamus and the alligator frisk and dive where the dwellings of Bornou once stood.
The sun shot his dazzling rays over this placid sheet of water, and toward the north the two elements merged into one and the same horizon.
The doctor was desirous of determining the character of the water, which was long believed to be salt. There was no danger in descending close to the lake, and the car was soon skimming its surface like a bird at the distance of only five feet.
Joe plunged a bottle into the lake and drew it up half filled. The water was then tasted and found to be but little fit for drinking, with a certain carbonate-of-soda flavor.
While the doctor was jotting down the result of this experiment, the loud report of a gun was heard close beside him. Kennedy had not been able to resist the temptation of firing at a huge hippopotamus. The latter, who had been basking quietly, disappeared at the sound of the explosion, but did not seem to be otherwise incommoded by Kennedy's conical bullet.
"You'd have done better if you had harpooned him," said Joe.
"But how?"
"With one of our anchors. It would have been a hook just big enough for such a rousing beast as that!"
"Humph!" ejaculated Kennedy, "Joe really has an idea this time--"
"Which I beg of you not to put into execution," interposed the doctor. "The animal would very quickly have dragged us where we could not have done much to help ourselves, and where we have no business to be."
"Especially now since we've settled the question as to what kind of water there is in Lake Tchad. Is that sort of fish good to eat, Dr. Ferguson?"
"That fish, as you call it, Joe, is really a mammiferous animal of the pachydermal species. Its flesh is said to be excellent and is an article of important trade between the tribes living along the borders of the lake."
"Then I'm sorry that Mr. Kennedy's shot didn't do more damage."
"The animal is vulnerable only in the stomach and between the thighs. Dick's ball hasn't even marked him; but should the ground strike me as favorable, we shall halt at the northern end of the lake, where Kennedy will find himself in the midst of a whole menagerie, and can make up for lost time."
"Well," said Joe, "I hope then that Mr.