I had small difficulty in persuading Koenraad du Plessis next morning to lead me to the place of misfortune. We settled to trek thither, hunting on our way; and in six days’ time we found ourselves outspanned for the night beneath the loom of the great rock fortress which held so securely the Dutchman’s secret. It was the hour of sunset as we neared the mountain range, which lay between us and the north-west. The sky was a sheet of red and gold, against which the rugged mass stood out in a wonderful relief. Up above the mountain tops, long skeins of great birds, all following one another slowly and majestically in an endless maze of evolutions, were silhouetted black against the flaming heavens. We were a good mile away from the nearest string, but there was a wonderful stillness of the atmosphere; all nature seemed hushed, except for the birds—and the faint notes of their peculiar plaintive whistle told me instantly what they were.

“Why, Koenraad,” I said, “those are pelicans, and they’re just going down to water somewhere in the mountains! See, there they go!”

As I spoke the lower skein sank gently into the mountains, and presently chain after chain of the singular evolutionaries disappeared softly within the range, until the last bird had vanished, and the now fading sky lay clear and unflecked.

“Allemaghte!” ejaculated Du Plessis in his deepest tones; “those are pelicans surely, and they have gone down to water. Strange that I have never seen them there before. There is the vlei, sure enough! We will never rest now till we find it.”

We were up at dawn next morning, and as we breakfasted we saw with intense interest the pelicans rise from the heart of the mountain, slowly circle about the sky, and then stretch their flight, in their leisurely and majestic fashion, in our direction. As they quitted the mountain, they sank lower towards the flat country, and some of them were evidently about to pass right overhead.

“They’ll come over the wagons,” said Du Plessis; “they’re off for that big salt pan we passed yesterday morning.”

I dived into my wagon, and took down my rifle. An idea had struck me. I pushed a cartridge into the breech, and, as the great birds passed slowly a hundred yards overhead, took aim at one and fired. The target was a big and an easy one: the stricken bird toppled downwards, turning over and over in its fall, and presently hit the earth with a tremendous thud. One of the boys ran and brought it to me. I opened its bill. The pouch contained seven fresh fish—six smallish and carp-like, well-known to the Boers as karpers, the seventh a “yellow fish,” a barbel-like fish of a pound and a half.

“Here, Koenraad,” I said to my companion, “is proof positive that your mysterious vlei lies in the mountain and holds water. These fish are fresh—they were caught early this morning; and the birds are away to the salt pan for the day to eat and digest them.”

We finished breakfast hastily, and sallied forth on our search. First, we followed the tiny stream near which we were camped. This led us to the westerly side of the mountain, and manifestly took its rise in some marshy ground immediately beneath the rock walls. A careful examination convinced me that the marsh itself owed its origin to some subterraneous escape—very probably from the vlei itself—from within the mountains. But there was no hope of ingress in that direction. Pursuing our investigations, we rode carefully round the whole western and southern face of the mountain-wall, scanning closely every yard of its surface. This mountain-wall ran in a great semicircle; its dark-red, rampart-like cliffs were sheer, and wonderfully free from projections and undergrowth. We spent the whole day searching for any trace of path or ingress, and retired to our wagons for the evening completely discomfited. There was not foothold for the hardiest cliff climber that ever risked his life in search of wildfowl eggs.

Next morning, we followed this cliff face along the southerly aspect. Here, after a little way, it was met by another mass of mountains, into which it ran, terminating in a chimney-like cul-de-sac at the end of a short narrow gorge. Here, too, apparently, there was no possible approach upward or inward.