Nor was the prospect pleasant to any of them. A little while ago they were moving swiftly at ease; now they rocked slightly in the swell, but did not go forward an inch. Hopeful that the wind would soon rise again they did not yet take to the oars. Meanwhile it was growing warmer. The reflection of the sun upon the water was dazzling, and they spread the sail again, not to catch the wind but as an awning to protect them from the burning rays. They also used the interval for food and drink, and as the wind still did not rise they were thinking of taking to the oars as a last resort when Henry called their attention to the southwest. "See that black spot down there," he said. "It seems to be only a few inches either way, but it doesn't look natural." "I'd call it a cloud," said Tom Ross judicially. "An' clouds ain't what we're wantin' jest now," said Jim Hart. Henry rose from his luxurious reclining position and gazed long and with great care at the black spot. He knew as well as Jim Hart that it was a cloud and he saw that it was growing. But a few inches across the horizon before, it stretched to feet and then to yards. Meanwhile not a breath of air stirred, the deep waters were waveless and the air hung hot and heavy about them. Henry had heard that dangerous storms came up very fast on the great lakes, and, although with no experience as a sailor except on rivers, he believed that one would soon be upon them. "Boys," he said, "look how that cloud grows. I believe we're in for a big wind and storm. We'd better take down our mast, make everything tight and strong, and get ready with the oars." All at once Henry resumed command, and the others instantly accepted it as the most natural and proper thing in the world. The mast was unshipped, it and the sail were lashed down, everything that was loose was put in the lockers, or was tied securely. Meanwhile the cloud grew with amazing rapidity. While the east and north were yet full of blazing light the south and west were darkening. A draught of cold wind came. The waters, motionless hitherto, suddenly heaved convulsively. Low thunder rolled, and the lightning flashed across the troubled waters. The five felt awe. They were familiar with great storms, but never before had they been in one with no land in sight. The little boat, which alone lay between them and the depths of the lake, became smaller and smaller. But the five, although they felt more tremors than when going into battle, sat with their oars in the thwarts, ready to fight as best they could the storm which would soon rush down upon them.