The boys woke up with a most uncomfortable feeling of oppression. They were hot and thirsty, yet they dared not touch the canteen of water. Although the sun had not risen, the heat seemed to be greater than they had ever known it before in the open air, and they lay and fanned their faces and fought the flies which were swarming around them.
When the sun rose, it showed a few little white clouds like puffs of steam, low down in the northern sky, and hiding the distant Musgrave Ranges from view. The sight of clouds is so unusual in Central Australia that the boys remarked about it to one another, and were amazed to see the difference which occurred in less than half an hour. The clouds had indeed risen and increased greatly during that short time. Instead of a few separate clouds, a big solid bank was now spreading all over the horizon, and huge pillars of white were stretching out from the main mass, far up into the sky.
Yarloo slept late, but when he woke up, he too stood and watched the rising clouds. He evidently did not like the look of things, for he shook his head, and, in reply to a question from Sax, replied:
"Me no like it. Me think it storm come up."
To the hot and thirsty white boys the word "storm" had only one meaning, and they uttered it together: "Rain!"
Yarloo smiled. "Neh," he replied. "Rain no come up. Me think it wind. P'raps sand. Me no like it." He set about building a little fire for breakfast, and though his companions were not in the least bit hungry, they followed his example and ate some damper and dried meat. Each man was allowed half a quart-pot of tea. Sax and Vaughan drank theirs with the meal, but Yarloo took a few sips and then put his quart-pot away in a safe place.
There was nothing to do all morning. Yarloo again made a little sun-shelter, but this became unnecessary after about ten o'clock, because by that time the rising clouds had covered the face of the sun. With every succeeding hour the oppressive heat seemed to get more and more unbearable. There was not a breath of wind. It was as if a lot of thick blankets were slowly smothering every living creature on the earth. The clouds were no longer white, except at the front edges and in places where a few great puffs bulged out. The rest was grey, getting darker and darker till it was near the horizon, and then it turned to brown. This brown looked like a huge curtain hung from the sky and trailing over the earth. Now and again it was lit up by flashes of lurid red, for all the world as if a furnace were roaring behind that curtain.
The air was absolutely still, deathlike still, and a sound which was exactly like the roaring of a furnace came out of the north, with an occasional louder boom when the pent-up fury of the storm burst through the brown cloud. In reality, the sound was made by millions of particles of sand being hurtled through the air by an electric storm.
The sound came nearer. The clouds were completely overhead now, from north to south, from east to west. There was not a patch of blue to be seen. The panting earth waited in abject fear. A puff of wind came, hot and stifling, as if an oven door had suddenly been opened. It passed over the mulgas, making them sigh and moan, and then was gone again, leaving the same breathless stillness. Another puff, this time cool and fresh. It also passed away and left the men with dread in their hearts—the dread of an unknown, unseen foe.
The storm was very near. Sax was watching it so intently that he jumped round suddenly when Yarloo touched him on the arm. The black-fellow was pointing to the canteen. "Drink, little drop," he said, and pointed to the approaching curtain of brown sand. He evidently meant that the boys would be better able to stand against the storm if they had a drink beforehand, so Sax motioned to Vaughan and poured a little water out into the two pannikins. Neither of them spoke. They were overawed by the might, the majesty, the mystery of Nature.