At the very edge of the mesa, overhanging the abyss so that its retaining wall was like a part of the cliff itself, was the old warlike church of Ácoma, with its two stone towers. Gaunt, grim, grey, its nave rising some seventy feet to a sagging, half-ruined roof, it was more like a fortress than a place of worship. That spacious interior depressed the Bishop as no other mission church had done. He held a service there before midday, and he had never found it so hard to go through the ceremony of the Mass. Before him, on the grey floor, in the grey light, a group of bright shawls and blankets, some fifty or sixty silent faces; above and behind them the grey walls. He felt as if he were celebrating Mass at the bottom of the sea, for antediluvian creatures; for types of life so old, so hardened, so shut within their shells, that the sacrifice on Calvary could hardly reach back so far. Those shell-like backs behind him might be saved by baptism and divine grace, as undeveloped infants are, but hardly through any experience of their own, he thought. When he blessed them and sent them away, it was with a sense of inadequacy and spiritual defeat. After he had laid aside his vestments, Father Latour went over the church with Jacinto. As he examined it his wonder grew. What need had there ever been for this great church at Ácoma? It was built early in sixteen hundred, by Fray Juan Ramirez, a great missionary, who laboured on the Rock of Ácoma for twenty years or more. It was Father Ramirez, too, who made the mule trail down the other side,--the only path by which a burro can ascend the mesa, and which is still called "El Camino del Padre." The more Father Latour examined this church, the more he was inclined to think that Fray Ramirez, or some Spanish priest who followed him, was not altogether innocent of worldly ambition, and that they built for their own satisfaction, perhaps, rather than according to the needs of the Indians. The magnificent site, the natural grandeur of this stronghold, might well have turned their heads a little. Powerful men they must have been, those Spanish Fathers, to draft Indian labour for this great work without military support. Every stone in that structure, every handful of earth in those many thousand pounds of adobe, was carried up the trail on the backs of men and boys and women. And the great carved beams of the roof--Father Latour looked at them with amazement. In all the plain through which he had come he had seen no trees but a few stunted piñons. He asked Jacinto where these huge timbers could have been found. "San Mateo mountain, I guess." "But the San Mateo mountains must be forty or fifty miles away. How could they bring such timbers?" Jacinto shrugged. "Ácomas carry." Certainly there was no other explanation.