"We have extra provisions, water and gasoline. My own judgment is we had better make at once for our starting point."

"I guess you are right," answered Alan after long thought; "I don't know what is to be gained by the trouble of a landing at the camp by the lake."

"Nothing but that hot supper," smiled Ned, "and we'll have to put that off a few days, I think."

"All right," agreed Alan, "set your course and with luck we'll do a little treasure hunting before dark."

This being settled, the prow of the Cibola was pointed a little west of northwest, and, dropping to a lower stratum to escape the lively eastern breeze at the higher altitude, the boys started at last directly for the and arid broken mountains of Northwestern Arizona.

This region, bordering on the great sand dunes lying beyond the Chelly River, was to be the beginning point of their arduous and momentous search. From that place to a point nearly one hundred miles to the southeast lay the secret fastnesses of mountain, canyon and mesa wherein, somewhere, according to the Spanish soldier's record, was the secret city of a dead race and the treasure that had brought Ned and Alan half way across a continent.

What such a search meant one glance at the monotonous and unending rock easily told. On foot, only the compass could lead a man forward in such wilderness of abrupt heights and winding chasms. As the boys meant to manage it, the attempt had possibilities, but it might mean days of drifting, of watching, of doubling back and forth over every possible site. And that was now their task.

So far as they could, Ned and Alan meant to begin at the extreme northern end of this unknown land and, sailing back and forth from east to west, cover every foot of exposed ground with their powerful glasses.

Both boys had long since agreed in this conclusion: the "city" meant no more than one large structure similar to but on a larger scale than those found in the Chaco Canyon at the extreme southern end of the Tunit Chas Mountains. This would be indicated now by nothing more than rectangular lines of wall stones, probably in piles, outlining the shape of the "city" or palace. Prominent among these ruins should be the more elevated temple, the object of their search. And beneath this should be found the underground "khivas" or religious chambers.

That this "city" was secret or hidden was proof to Ned and Alan and Major Honeywell that it would not occupy a prominent place such as an exposed plateau or a high level mesa. Only one other location was left, the abutting shelf of some canyon. And the young navigators had pictured to themselves that, if this should prove to be the location, the shelf would be so elevated as not to be visible from the front or below and that it would be concealed from above by an extended and overhanging cliff.