Stanley could no longer see Big Thumb. The slope of the mountain was in the way.

"We're almost there," said Stanley. He could see the base of the mountain.

Stanley would have liked to stop and rest, but he was afraid they'd never get started again. As long as Zero could keep going, he could keep going, too. Besides, he knew they didn't have much daylight left.

Patches of weeds dotted the mountainside. They walked from one patch to another, using the weeds as footholds. As they got higher, the weeds got thicker. Many had thorns, and they had to be careful walking through them.

Now that they really were almost there, it scared him. Big Thumb was his only hope. If there was no water, no refuge, then they'd have nothing, not even hope.

It became too steep to go straight up. Instead they zigzagged back and forth, increasing their altitude by small increments every time they changed directions.

There was no exact place where the flat land stopped and the mountain began. The ground got steeper and steeper, and then there was no doubt that they were heading up the mountain.

Stanley gave him some more words. "B -- u -- g -- s," he spelled.

The swarm of gnats stayed behind, preferring the contents of Zero's stomach to the sweat on the boys' faces.

"How are you doing?" Stanley asked.

A wide smile spread across Zero's sick and weary face as well. "Bugs," he said.

As the sky darkened, bugs began appearing above the weed patches. A swarm of gnats hovered around them, attracted by their sweat. Neither Stanley nor Zero had the strength to try to swat at them.

Zero concentrated hard, then said, "Boogs."

"Good," said Stanley. "Remember, it's a short 'u' if there's no 'e' at the end. "Okay, here's a hard one. How about, l -- u -- n -- c -- h?"

Stanley laughed.

Zero pointed thumbs up. Then he said, "If a gnat lands on me, it will knock me over."

"Luh -- Luh-un --" Suddenly, Zero made a horrible, wrenching noise as he doubled over and grabbed his stomach. His frail body shook violently, and he threw up, emptying his stomach of the sploosh.

He leaned on his knees and took several deep breaths. Then he straightened up and continued going.

Stanley didn't give him any more words, thinking that he needed to save his strength. But about ten or fifteen minutes later, Zero said, "Lunch."

As they climbed higher, the patches of weeds grew thicker, and they had to be careful not to get their feet tangled in thorny vines. Stanley suddenly realized something. There hadn't been any weeds on the lake.

"Weeds and bugs," he said. "There's got to be water around somewhere. We must be getting close."

He didn't get up. Stanley bent over him. "C'mon, Zero," he urged. "We're getting close. C'mon, Hector. Weeds and bugs. Weeds and boogs."

A wide clown-like smile spread across Zero's face. He flashed the thumbs-up sign, then fell.

Stanley shook him. "I've already ordered your hot fudge sundae," he said. "They're making it right now."

Zero said nothing.