stream of cooler air; and wherever two of these streams, flowing in different directions, strike one another, a little whirlwind ensues, and makes itself manifest as a sand-pillar. The coachman’s “molino de viento,” as he called it, may very well have happened, but it must have been a whirlwind on a large scale, caused by the meeting of great atmospheric currents, not by the little apparatus we saw at work.
There seems to be hardly a village in the plain; and the only buildings we see for miles are the herdsmen’s houses of stone, flat-roofed, dark inside, and uninviting in their appearance, and the great cattle-pens, the corrals, which seem absurdly too large for the herds that we have yet seen; but in two or three months there will be rain, the ground will be covered with rank grass, the corrals will be crowded with cattle every evening; the mirage will depart when real water comes, dust and sand-pillars will be no longer to be seen, and all the nine horses and mules of the diligence-team, floundering, splashing, and kicking, will hardly keep the heavy coach from settling down inextricably in the mire. And so on until October, and then the season of water, “la estación de las aguas,” will cease, and things will be again as they are now.