They could not converse; only the lightning prevented their becoming separated, as it alone permitted Valthor to keep his course across the grassy floor of the valley in the direction of the city of gold where they would find the road that led to the Pass of the Warriors and on into the valley of Thenar.

Presently they came within sight of the lights of the city, a few dim lights framed by the casements of windows; and a moment later they were on the road and were moving northward against the full fury of the storm. And such a storm! As they moved toward its center it grew in intensity; against the wind that accompanied it they waged a grim battle that was sometimes to them and sometimes to the wind, for often it stopped them in their tracks and forced them back.

For miles they pitted their muscles against the Herculean strength of the storm god; and the rage of the storm god seemed to rise against them, knowing no bounds, as though he was furious that these two puny mortals should pit their strength against his. Suddenly, as though in a last titanic effort to overcome them, the lightning burst into a mighty blaze that illuminated the entire valley for seconds, the thunder crashed as it had never crashed before, and a mass of water fell that crushed the two men to earth.

As they staggered to their feet again foot-deep water swirled about their legs; they stood in a broad, racing torrent that rushed past them toward the river; but in that last effort the storm god had spent his force. The rain ceased; through a rift in the dark clouds the moon looked down, perhaps in wonder, upon a drowned world; and Valthor led the way again toward the Pass of the Warriors. The last storm of the rainy season was over.

It is seven miles from the Bridge of Gold, that is the gateway to the city of Cathne, to the ford where the road to Thenar crosses the river; and it required three hours for Valthor and Tarzan to cover the distance, two hours for the first third and one hour for the remainder; but at last they stood at the river's brink.

A boiling flood confronted them, tearing down a widened river toward the city of Cathne. Valthor hesitated. "Ordinarily," he said to Tarzan, "the water is little more than a foot deep. It must be three feet deep now."

"And it will soon be deeper," commented the ape-man. "Only a small portion of the storm waters have had time to reach this point from the hills and the upper valley. If we are going to cross tonight, we shall have to do it now."

"Very well," replied Valthor, "but follow me; I know the ford."

As the Athnean stepped into the water the clouds closed again beneath the moon and plunged the world once more into darkness. As Tarzan followed he could scarcely see his guide ahead of him; and as Valthor knew the ford he moved more rapidly than the ape-man with the result that presently Tarzan could not see him at all, but he felt his way toward the opposite bank without thought of disaster.

The force of the stream was mighty; but mighty, too, are the thews of Tarzan of the Apes. The water, which Valthor had thought to be three feet in depth, was soon surging to the ape-man's waist, and then he missed the ford and stepped into a hole. Instantly the current seized him and swept him away; not even the giant muscles of Tarzan could cope with the might of the flood.