Needle

While the hard-surfaced road stopped at the last of the sheds, the construction machinery had beaten a very plain trail which formed a continuation of it. It proved better, however, to traverse this section on foot, and the boys soon abandoned the bicycles rather than walk them. It was not far to go-three hundred yards to the big tank, seventy more along its lower wall, and as much farther to the scene of activity.

Like its neighbor, the new tank was on the hillside, partly cut into the ground and partly above it. The floor had been laid, reinforced, and the concrete cast; those portions of the walls that lay against the earth of the hillside were occupying the attention of the men at the moment. The boys noted with relief that digging seemed to have ended; it should, then, be possible to borrow the tools they needed. They had, as a matter of fact, surprisingly little trouble; they encountered Rice's father almost at once, and he readily located a couple of crowbars and gave permission to take them. He may have had ulterior motives; nearly all the children of the island between the ages of four and seventeen were underfoot at the time-the men were seriously considering having a local regulation passed ordering school to keep seven days a week-and anything that looked as though it might get rid of some of them would have been encouraged. The boys cared nothing about his reasons; they took the bars and returned the way they had come.

It was an encouraging start, but the rest of the morning was less so. They reached the pool without noteworthy delay, and went to work, diving by turns and pecking away at the concrete with the crowbars. They could not even work on the seaward side of the plug; anyone entering the water on that side of the islet would have been cut to pieces against the coral by the first breaker. They had chipped away enough to encourage them by di

After the meal, however, meeting at the usual place, they found one of the jeeps parked by the culvert. Standing beside it were Rice and his father and in the back seat was some equipment which the boys recognized.

"Dad's going to blast the gate for us!" called the younger Rice, quite superfluously, as the others arrived. "He got away from the tank for a couple of hours."

"Anything to get you out of my hair," remarked his father. "You'd better stick to your bikes-you, too, Ken. I'll ride the sticks."

"It's safe enough!" remonstrated Bob, who wanted to examine the plunger more closely.

The man looked at him. "No remarks from you," he said. "Your father would have the bunch of you stay here while he laid the charge and come back here with you to fire it! And I don't blame him a bit." He climbed under the wheel without further comment; and Bob, who knew that Mr. Rice had spoken the truth, mounted his bicycle and headed northwest, followed by the others.

At the Hay house the jeep was parked and its load removed. Mr. Rice insisted on carrying the dynamite and caps himself, though Bob thought he had a good argument when he claimed they should not be carried together. The wire and plunger were taken in charge by Bob and Malmstrom, and everybody headed for the beach on foot. They went a little to the left of the course the boys had followed Wednesday and emerged at the southern end of the strip of sand.

Here, as at the pool, the reef reappeared, curving away to the south and east, eventually to circle the island almost completely. On the southern side the lagoon was narrower, the reef never being more than half a mile from the shore, and no attempt had so far been made to build any installations on this side. Where the barrier started at the south end of the little beach was a passage from open sea to lagoon similar to that isolating the islet of the pool; but this was much narrower, offering at the base barely passage for a rowboat.

This was the "gate" to which Rice had referred. It looked, from a little distance, as though it were perfectly clear; but a closer inspection showed, as Rice had said, that there was an obstruction. The end of the passage toward the beach, which was exposed to the waves from the open sea to the west, had been neatly plugged by a brain coral about six feet in diameter, which had been dislodged from some point farther out in the reef and rolled about, probably by successive storms, until it had wedged securely where the waves could drive it no farther. Even the boys had not had to look twice to know they could never shift the huge thing by hand labor, though they had made some half-hearted attempts to break away-enough coral to clear a passage around it.

It was possible, obviously, to reach the southern lagoon in a boat by rowing around the other end of the island, but it was generally agreed that clearing the gate would be worth the trouble.

Mr. Rice unbent sufficiently to allow Colby to place the charge-he did not want to go under water himself- after careful instruction; but he made everyone follow him back to the palm trees and take shelter behind the sturdy trunks before he fired it. The results were very satisfactory: a column of spray and coral chips fountained into the air, accompanied by a moderate amount of noise -dynamite is not particularly loud stuff. When the rain of fragments seemed to be over, the boys raced back to the gate and found that there would be no need of a second blast. About a quarter of the original piece was visible, rolled some distance from its original site; the rest had completely disappeared. There was ample room for the boat.

The boys controlled their exuberance sufficiently to help Mr. Rice pack the blasting equipment back into the jeep; but from that point their opinions were divided. Hay and Malmstrom wanted to go back to work on the pool; Bob and Rice wanted to take advantage of the newly opened gate to explore the southern reef. Colby, as usual, cast no vote. None of them thought of splitting up; and, oddly enough, Hay won the argument, his main point being that it was already well along in the afternoon, and it would be much better to start in the morning and spend the entire day on the reef.

Bob would have been considerably more insistent, in order to let the Hunter examine the rest of his "probable landing" area, but the detective had informed him the night before of the nature of the piece of metal that had indirectly caused Rice's accident.

"It was a generator casing from a ship similar to mine," he said. "And it certainly was not from my own. I am certain of my facts; if I had merely seen it, there might be a chance of error-I suppose your people might have apparatus that would look like it from a little distance- but I felt it while you were pulling at it barehanded. It had line-up marks etched into the metal, indicated by letters of my own alphabet."

"But how did it get there, when the rest of the ship isn't around?"

"I told you our friend was a coward. He must have detached it and carried it with him for protection, accepting the delay such a load would have caused. It was certainly good armor, I will admit; I ca

"Can you judge what he would do then?"

"Exactly what I said before-pick up a host at the first opportunity, anyone he could catch. Your friends are still definitely under suspicion, including the young man who went to sleep near the reef with a boatload of explosive."

In consequence of this information, Bob was willing to forego the examination of the southern reef, and to spend an afternoon at dull work. It would give him time to think; and thought seemed necessary. He was rewarded during the afternoon with one idea, but he was unable to speak clearly enough with the others around to get it across to Hunter. He finally gave up trying for the time being and concentrated on chipping concrete.