“No, indeed. But something we may dread as much—ay, more—than them. If my eyes don’t deceive me, that’s a tormenta.”

“Ha!” exclaims the young cacique, at length comprehending. “A tormenta, you think it is?”

The others of the band mechanically mutter the same word, in like tones of apprehension. For although slow to perceive the sign, even yet but slightly perceptible, all of them have had experience of the danger.

“I do, chief,” answers he interrogated. “Am now sure of it.”

While they are still speaking it—the cloud—mounts higher against the blue background of sky, as also becomes more extended along the line of the horizon. Its colour, too, has sensibly changed, now presenting a dun yellowish appearance, like that mixture of smoke and mist known as a “London fog.” But it is somewhat brighter, as though it hung over, half-concealing and smothering, the flames of some grand conflagration.

And as they continue regarding it, red corruscations begin to shoot through its opaque mass, which they can tell to be flashes of lightning. Yet all this while, upon the spot where they have pulled up the sun is shining serenely, and the air still and tranquil as if gale or breeze had never disturbed it!

But it is a stillness abnormal, unnatural, accompanied by a scorching heat, with an atmosphere so close as to threaten suffocation.

This, however, lasts but a short while. For in less than ten minutes after the cloud was first descried, a wind reaches them blowing directly from it at first, in puffs and gusts, but cold as though laden with sleet, and so strong as to sweep several of them from the backs of their horses. Soon after all is darkness above and around them. Darkness as of night; for the dust has drifted over the sun, and its disc is no longer visible—having disappeared as in a total eclipse, but far more suddenly.

It is too late for them to retreat to any place of shelter, were one ever so near, which there is not. And well know they the danger of being caught in that exposed spot; so well that the scene now exhibited in their ranks is one of fright and confusion.

Terrified exclamations are sent up on all sides, but only one voice of warning, this from him who had first descried the cloud.