"Worse than mosquitoes," said Charley; "they feel more like yellow jackets or hornets, I should say; and they're inside our clothes too."

"Whew!" exclaimed Ned, leaping out of the bunk, "I didn't think of that."

"What is it?" asked both the other boys in a breath.

"A swarm of sand-flies."

"Sand-flies! what are they?" asked Jack.

"Wait, and I'll show you," replied Ned, going out and stirring up the fire so as to make a light. Meantime the boys rubbed and writhed and turned themselves about in something like agony, for, though they suffered no severe pain at any one spot, their whole bodies seemed to be covered with red pepper. Every inch of their skins was inflamed, and the more they rubbed the worse the irritation became.

When Ned had made a bright light, he showed his companions what their tormentors were. Jack and Charley saw some very minute flying insects--true flies indeed--not much larger than the points of pins.

There were millions of the creatures. The whole air seemed full of them indeed, and wherever one rested for a moment upon the skin of its victim, there was at once a p.r.i.c.king sensation, followed by the intolerable burning and irritation already mentioned.

Charley was at first incredulous. "You don't mean to tell me," he said, "that those little gnats have done all this."

"Yes, I do," answered Ned, "and more than that, I have known them to kill a horse, tormenting him to death in a few hours. They'll get under a horse's hair by millions and literally cover him, until you can see the hair move with them. But they are not gnats."

"But, see here, Ned," said Jack; "when I barely touch one of the creatures, it not only kills him but distributes him pretty evenly over the surrounding surface. They haven't strength enough to hang together."

"Yes, I know," replied Ned; "what of that?"

"Why, how can such things bite so? and especially how can they force their way through our blankets and clothes? I should think they'd tear themselves to pieces in the attempt."

"So should I, if I didn't know better; but as a matter of fact they do manage to get through without dulling their teeth, as we have proof."

"Have the creatures teeth?" asked Charley.

"No, of course not; but they have a sort of rasping apparatus which is just as bad. They have an acrid kind of saliva too, which they put into the wounds they make, and that is what smarts so. But come, this won't do. We must make a good smudge."

"What's a smudge?" asked Jack.

"I'll show you presently," answered Ned, while he began to build a small fire immediately in front of the tent. When it had burned a little, he smothered it with damp leaves and moss, so that it gave off a dense cloud of smoke which quickly filled the hut.

"Now the tent will soon be clear of them," said Ned.

"Sand-flies object to smoke, I suppose," said Jack.

"Very much indeed," answered Ned, "and it is customary here on the coast to have a pair of smudge boxes in front of every house."

"I don't blame them for objecting," grumbled Charley, coughing and wiping his smoke-inflamed eyes; "I can't say that I find smoke the most delightful atmosphere myself. But what is a 'smudge box,' Ned?"

"Simply a shallow box of earth set upon a post, to build a smudge upon."

"I say, Ned," asked Jack, "what do you mean by saying that sand-flies aren't gnats?"

"Simply that they aren't," said Ned.

"What are they, then?"

"Flies."

"Well, what is a small fly but a gnat?"

"And what is a gnat but a small fly?" added Charley.

"The two are not at all the same thing," answered Ned. "That is a popular mistake. I have heard people say they could stand mosquitoes, but couldn't endure gnats; and yet the mosquito is a gnat, and what these people call gnats are not gnats at all, but simply small flies."

"What const.i.tutes the exact difference?"

"The shape of the body. All flies are two-winged insects, and gnats are flies in that sense, of course; but gnats are those flies that have long bodies behind their wings, to balance themselves with. Mosquitoes are our best example of them. These sand flies, you see, have very short bodies."

"Yes, but very long bills, I fancy," said Charley.

"Well," said Jack, "all that is news to me."

"I suppose it is. Most people think a whale is a fish, too, but for all that it is nothing of the kind. What are you doing, Charley?"

"Tossing up heads or tails for it," answered Charley, who had left the tent and gone to the large fire.

"Tossing up for what?"

"To determine the method and manner of my death," answered Charley, with profound gravity. "If I stay in the hut I shall die of suffocation in the smoke, and if I stay out here the sand flies will kill me. I can't quite make up my mind which death I prefer, so I'm tossing up for it."

"Good! there's a breeze," said Ned; "if it rises it'll relieve you of the necessity of choosing."

"How? By blowing the smoke away, and so giving the sand flies a fair field?"

"No; by blowing the sand flies away; they can't stand much of a breeze.

It is coming up, too, and we shall get some sleep after all."

The breeze did indeed rise after a time, but the dawn was almost upon them before the boys really slept again, so severely were their skins irritated by their small enemies.

They had learned a lesson, however, and during the rest of their stay on the island they never neglected to make a smudge in front of the hut before attempting to sleep. It was not often that the sand flies appeared in such numbers as on this night, and hence it was not often necessary to fill the tent too full of smoke for comfort.

CHAPTER VIII.

THE BEGINNING AND END OF A VOYAGE.

The first care of the boys the next morning was to dig their well. This was a comparatively trifling task, as they had only to dig four or five feet through soft alluvial soil and sand. Instead of making perpendicular sides to their well, they dug it out in the shape of a bowl, so that they could walk down to the water and dip it up as they needed it.

Having a hut to live in and a well from which to get fresh water, they were now free to begin the sport for which they had come to the island.

They went fishing first, of course, that being the obvious thing to do, but after a few hours of this the tide became too full, and the fish ceased to bite satisfactorily.