Every hour of the journey presented some additional evidence that the kafila was leaving the great desert behind, and drawing near a land that might be considered fertile.

On the day after parting from the wreckers a walled town was reached, and near it, on the sides of some of the hills, were seen growing a few patches of barley.

At this place the caravan rested for the remainder of the day. The camels and horses were furnished with a good supply of food, and water drawn from deep wells. It was the best our adventurers had drunk since being cast away on the African coast.

Next morning the journey was continued.

After they had been on the road about two hours, the old sheik and a companion, riding in advance of the others, stopped before what seemed, in the distance, a broad stream of water.

All hastened forward, and the Boy Slaves beheld a sight that filled them with much surprise and considerable alarm. It was a stream,—a stream of living creatures moving over the plain.

It was a migration of insects,—the famed locusts of Africa.

They were young ones,—not yet able to fly; and for some reason, unknown perhaps even to themselves, they were taking this grand journey.

Their march seemed conducted in regular order, and under strict discipline.

They formed a living moving belt of considerable breadth, the sides of which appeared as straight as any line mathematical science could have drawn.

Not one could be seen straggling from the main body, which was moving along a track too narrow for their numbers,—scarce half of them having room on the sand, while the other half were crawling along on the backs of their compagnons du voyage.

Even the Arabs appeared interested in this African mystery, and paused for a few minutes to watch the progress of the glittering stream presented by these singular insects.

The old sheik dismounted from his camel; and with his scimitar broke the straight line formed by the border of the moving mass—sweeping them off to one side.

The space was instantly filled up again by those advancing from behind, and the straight edge restored, the insects crawling onward without the slightest deviation.

The sight was not new to Sailor Bill's brother. He informed his companions that should a fire be kindled on their line of march, the insects, instead of attempting to pass around it, would move right into its midst until it should become extinguished with their dead bodies.

After amusing himself for a few moments in observing these insects, the sheik mounted his camel, and, followed by the kafila, commenced moving through the living stream.

A hoof could not be put down without crushing a score of the creatures; but immediately on the hoof being lifted, the space was filled with as many as had been destroyed!

Some of the slaves, with their naked feet, did not like wading through this living crawling stream. It was necessary to use force to compel them to pass over it.

After looking right and left, and seeing no end to the column of insects, our adventurers made a rush, and ran clear across it.

At every step their feet fell with a crunching sound, and were raised again, streaming with the blood of the mangled locusts.

The belt of the migratory insects was about sixty yards in breadth; yet, short as was the distance, the Boy Slaves declared that it was more disagreeable to pass over than any ten miles of the desert they had previously traversed.

One of the blacks, determined to make the crossing as brief as possible, started in a rapid run. When about half way through, his foot slipped, and he fell full length amidst the crowd of creepers.

Before he could regain his feet, hundreds of the disgusting insects had mounted upon him, clinging to his clothes, and almost smothering him by their numbers.

Overcome by disgust, horror, and fear, he was unable to rise; and two of his black companions were ordered to drag him out of the disagreeable company into which he had stumbled.

After being rescued and delivered from the clutch of the locusts, it was many minutes before he recovered his composure of mind, along with sufficient nerve to resume his journey.

Sailor Bill had not made the crossing along with the others; and for some time resisted all the attempts of the Arabs to force him over the insect stream.

Two of them at length laid hold of him; and, after dragging him some paces into the crawling crowd, left him to himself.

Being thus brought in actual contact with the insects, the old sailor saw that the quickest way of getting out of the scrape was to cross over to the other side.

This he proceeded to do in the least time, and with the greatest possible noise. His paces were long, and made with wonderful rapidity; and each time his foot came to the ground, he uttered a horrible yell, as though it had been planted upon a sheet of red-hot iron.

Bill's brother had now so far recovered from his feigned illness, that he was able to walk along with the Boy Slaves.

Naturally conversing about the locusts, he informed his companions, that the year before he had been upon a part of the SaÄran coast where a cloud of these insects had been driven out to sea by a storm, and drowned. They were afterwards washed ashore in heaps; the effluvia from which became so offensive that the fields of barley near the shore could not be harvested, and many hundred acres of the crop were wholly lost to the owners.