"I understand, Citláli. I promise, we shall live together as chastely as brother and sister, bachelor and spinster."

Which is what we did, and for quite a long time, during which many things occurred, of which I shall try to tell in sequence.

That first day, I removed my belongings—and the sloshing axixcáli pot—from the Mesón de San José, never to go there again. I also took away with me the artificer Pochotl, and led him to the Cathedral, and introduced him to the notarius Alonso, and highly recommended him as the one man best qualified to devise all those sacramental baubles that were wanted. Before Alonso, in turn, led him off to meet the clerics who would instruct and supervise him, I told Pochotl where I would be living from now on, and then told him in an undertone:

"I will, of course, be seeing you here at the Cathedral, and will be much interested in your progress with this work. But I trust you will report to me at my new lodgings your progress in that other work."

"I will, to be sure. If all goes well for me here, I shall be immeasurably indebted to you, Cuatl Tenamáxtli."

And that very night I began my attempts at concocting pólvora. All the traveling the axixcáli had endured had not dissolved or disturbed the little whitish crystals that, true to Citláli's word, had formed in the bottom of the pot. I gingerly extracted those from the xitli, and set them to dry on a piece of bark paper. Then, simply at a venture, I set the pot itself on the hearth fire until the remaining urine came to a boil. It produced a fearful stink and made Citláli exclaim, in mock horror, that she was sorry she had let me move into the house. However, my venture proved worthwhile; when all the xitli had boiled away, it left still more of the little crystals.

While all of those were drying, I went off to the market and easily found lumps of charcoal and of the yellow azufre for sale, and brought home with me a quantity of each. While I pounded those lumps into powder with the heel of my Spanish boot, Citláli, though still abed, ground the xitli crystals on a métlatl stone. Then, on my piece of bark paper, I thoroughly mixed the black, yellow and white grains together in equal measure. For the sake of caution against accident, I took the paper to the muddy alley outside the house. A number of the neighborhood children, already attracted by the stench I had inflicted on the locality, watched with curiosity as I touched an ember from the hearth to that powder mixture. And then they cheered, though the result was no thunder or lightning, merely a small, sparkly fizzle and a cloud of smoke.

I was not too disappointed to make a gracious bow to the children in thanks for their applause. I had already perceived, in the pinch of pólvora I had got from the young soldier-fowler, that the mixture was not compounded equally of black, white and yellow. But I had to start somewhere, and this first attempt had been a success in one important respect. Its cloud of blue smoke smelled exactly like the smoke that had erupted from the arcabuces at the lakeside. So the crystal derived from female urine must be the third ingredient of pólvora. Now I had only to try various proportions of those ingredients to achieve the proper balance. My chief problem, obviously, would be the procurement of enough of those xitli crystals. I half thought of asking the gathered children to run home and bring me all their mothers' axixcáltin. But I dismissed that idea; it would cause questions from the neighbors—the first, probably, being their asking why a demented man was at large in their streets.

Some months went by, during which I kept boiling urine at every opportunity, until I think the neighborhood in general had got used to the smell, but I personally was getting thoroughly sick of it. Anyway, that labor did yield the crystals, though still in minute quantities, making it difficult for me to try differing measures of the white powder and the other two colors. I kept track of all my experiments, recording them on a piece of paper that I was careful not to misplace—listing them like this: two parts black, two yellow, one white; and three parts black, two yellow, one white; and so on. But no mixture I tried gave any more heartening result than the very first, when the proportions had been one and one and one. That is to say, most mixtures provided only a sparkle, fizzle and smoke, and some gave no result at all.

Meanwhile, I had explained to the notarius Alonso why I was ceasing to attend the classes at the Colegio. He agreed with me that my fluency in Spanish would be best improved, henceforward, by my actually speaking and hearing it, rather than studying the rules of it. He was not so approving, however, of my retirement from Tete Diego's teachings about Christianity.

"You could be imperiling the salvation of your immortal soul, Juan Británico," he said solemnly.

I asked, "Would not God count it a good deed that I hazard my salvation in order to support a helpless widow woman?"

"Well..." he said, uncertain. "But only until she is able to support herself, Cuatl Juan. Then you must resume your preparation for Confirmation."

At intervals thereafter, he would inquire as to the health and condition of the widow, and every time I could tell him honestly that she was still housebound, having to care for her crippled child. Thereafter, too, I believe Alonso kept me employed long beyond the time that I was really of any use to him—finding ever more obscure, even dull and valueless pages of word-pictures made far away and long ago, for me to help him translate—just because he knew that my wages went mostly for the upkeep of my little household.

Whenever I was not occupied with that, I visited the several workrooms that the Cathedral had provided for Pochotl. His clerical employers had first tested his skill by giving him a very small amount of gold in a lump, to see what he might do with it. I forget what it was that he created, but it made the priests ecstatic. From then on, they allowed him increasing quantities of gold and silver, and gave him instructions as to what to make—candlesticks and censers and various urns—and left the actual design of those things to him, and were vastly pleased with every one of them.

So now Pochotl was master of a smelter room where all the metals he used were melted and refined; a forging room where the coarser metals—iron, steel, brass—were hammered into shape; a room of mortars and crucibles in which the precious metals were liquefied; a room of workbenches, all strewn with tools of the utmost delicacy. And of course he had many assistants, some of them who had previously also been jewel-artificers in Tenochtítlan. But most of the helpers were slaves—and most of those were Moros, because those people are immune to the hottest heat—who did the heavy drudgery requiring not much skill.

Naturally, Pochotl was as happy as if he had been transported alive to the blissful afterworld of Tonatíucan—"Have you noticed, Tenamáxtli, how I am becoming enviably fat again, now that I am well paid and well fed?"—and he enjoyed showing me his every new production, and he took pleasure in my admiring them as much as the priests did. But there at the Cathedral he and I never spoke of his other work; that project we discussed only when he came to the house, to ask questions about various parts of the arcabuz that I had sketched for him:

"Is this piece supposed to move like so? Or like so?"

And in time he began to bring actual metal pieces to show, for my approval or comment.

"It is a good thing," he said, "that you got me appointed to the Cathedral's enterprise at the same time you asked me to build this weapon. Just the making of the arcabuz's long, hollow tube would have been impossible without the tools I now have. And only today, I was trying to bend a thin metal strip into that spiral you called a spring, and fumbling at it, when I was unexpectedly interrupted by a certain Padre Diego. He startled me by speaking to me in Náhuatl."