Stobart sat up, prepared for anything which this black-fellow—who knew the father, and seemed so devoted to the son—might suggest. The man pointed down across the trampled sand towards the cattle-troughs. He did it again and again, making little runs in that direction and coming back at once, like a dog who wants its master to go in a certain direction.
"All right, I'll come," whispered Sax at last, forgetting that the man probably could not understand him. Sax had intended to go alone, but when he stood up, Vaughan opened his eyes and asked sleepily: "What's all the row about?"
"No row at all," whispered his companion. "That is, unless you make it. There's something wrong somewhere and I'm going to have a look."
"So am I," responded Vaughan quickly, for the chance of an adventure drove all sleep away from him. "So am I. You bet your life."
The silent native led the way, armed with a boomerang and a shield, creeping from the shelter of one building to that of another, till they were close to the troughs. The man held up his finger and listened. There was a sound of running water. Sax recognized it as the ball-valves of the troughs. There were four of them. Suddenly the thought struck him: Why were they running? From where the three men were standing the dark lines of the troughs could be seen even at night, against the light-coloured sand, and it was clear that no stock were drinking there. But if the valves were running it showed that the troughs were empty, and the water must be flowing away somewhere. It must be wasting.
The importance of water in the desert had already impressed itself upon the white boys, and as soon as they realized that precious water was running away in the sand, they rushed out from behind the shelter towards the troughs. The armed native went with them.
There should have been a plug at the end of each trough. Somebody had pulled these plugs out, and the water was gushing a full stream through the four ball-valves and was running to waste over the sand. This had apparently not been going on for more than five or ten minutes, but it was absolutely necessary to stop the waste; for if once the overhead tank was drained dry, and if there was no wind to work the mill for a day or two, Sidcotinga Station would be entirely without water.
The boys did not stop to wonder who had done this dastardly deed, but went to jam the plugs back again into their holes. But the plugs could not be found. Something must be done immediately. It would waste precious time to run back to the station and hunt round for something to make plugs out of, so they started to fill the ends of the troughs with sand and clay, scooping it up with their hands and ramming it tight till one after another of the leakages was stopped.
When they were occupied with the fourth, and had nearly made a tight job of it, Sax looked around for the native who had told them that something was wrong. The man was standing a couple of yards away with his shield raised. He looked for all the world as if he was defending them from some attack. And so he was. Scarcely had Sax begun to work again, scooping more sand and clay and plastering it smooth and firm, when he heard the click of wood against wood, and a spear stuck into the ground just behind him. Another followed and another with hardly any pause between. The native still maintained his attitude of tense watchfulness. He had already turned three messengers of death off with his shield, and was waiting for more. None came.
He backed slowly towards the boys, still facing in the direction from which the spears had come. Presently he turned quickly and pointed to Government House, and then took up the same position of attention. His meaning was quite clear. He wanted one of the boys to go up to Government House and give the alarm.