“Fine!” I exclaimed heartily, and thrust out my hand to him. “I'm thinking of striking over the range soon to the Manasarowar Lakes. There's a curious flora I'd like to study.”

“Anywhere you say suits me,” he answered.

We clasped hands on our partnership and soon we were on our way to the valley's western gate; our united caravans stringing along behind us. Mile after mile we trudged through the blue poppies, discussing the enigmas of the twilight and of the night.

In the light of day their breath of vague terror was dissipated. There was no place for mystery nor dread under this floor of brilliant sunshine. The smiling sapphire floor rolled ever on before us.

Whispering little playful breezes flew down the slopes to gossip for a moment with the nodding flowers. Flocks of rose finches raced chattering overhead to quarrel with the tiny willow warblers, the chi-u-teb-tok, holding fief of the drooping, graceful bowers bending down to the little laughing stream that for the past hour had chuckled and gurgled like a friendly water baby beside us.

I had proven, almost to my own satisfaction, that what we had beheld had been a creation of the extraordinary atmospheric attributes of these highlands, an atmosphere so unique as to make almost anything of the kind possible. But Drake was not convinced.

“I know,” he said. “Of course I understand all that—superimposed layers of warmer air that might have bent the ray; vortices in the higher levels that might have produced just that effect of the captured aurora. I admit it's all possible. I'll even admit it's all probable, but damn me, Doc, if I BELIEVE it! I had too clearly the feeling of a CONSCIOUS force, a something that KNEW exactly what it was doing—and had a REASON for it.”

It was mid-afternoon.

The spell of the valley upon us, we had gone leisurely. The western mount was close, the mouth of the gorge through which we must pass, now plain before us. It did not seem as though we could reach it before dusk, and Drake and I were reconciled to spending another night in the peaceful vale. Plodding along, deep in thought, I was startled by his exclamation.

He was staring at a point some hundred yards to his right. I followed his gaze.