Undoubtedly, it was this stone door with which the Pueblos used to regulate their water-supply, prying it up and holding it in position, perhaps, with blocks of wood, which, after the Indians deserted the valley, had in time rotted away, allowing the gate to fall, thus shutting off the water entirely.

However that may have been, one thing at any rate was certain:—Whenever our flume and our ditch were ready, here was water enough for thousands of acres only waiting to be let loose.

For a long time Dick and I stood with our hands resting on the top of the head-gate and our chins resting on our hands, watching the water as it went foaming and splashing down the other ravine, and as we stood there, there came over us by degrees a sense of the real importance to us of this discovery. We were only boys, after all, and we had gone into this enterprise more or less in the spirit of adventure, but now it gradually dawned upon us that we had in reality arrived at a point where the roads forked:—Here, ready to our hands, was work for a lifetime, and we had to decide whether we were going into it heart and soul or whether we were not. Every boy arrives at this fork in the roads sooner or later, and when he does, he is apt to feel pretty serious. I know we did.

With us, however, the question seemed to settle itself, for Dick, presently straightening up and turning to me, said:

"Frank! What will your Uncle Tom say? Will he be willing that you should stay out in this country and take to wheat-raising and ditch-building and so forth?"

"If I know Uncle Tom," I replied, "he'll be not only willing but delighted. If we make a success of this thing—as we will if hard work will do it—just imagine how proudly he will point to us as proofs of his theory that a fellow may sometimes learn more out of school than in it. In fact, if I'm not much mistaken, he will be eager to help; and if we need money for the work, as we certainly shall, I shan't hesitate to ask him for it. I shall inherit a little when I come of age, and I'm pretty sure Uncle Tom will advance me some if I need it. But how about the professor, Dick? How will he fancy the idea of your settling down in this valley? For if we do go into this thing in earnest, that is what it means."

"I know it does," replied my companion, seriously. "And I'm glad of it. I'll let you into a little secret, Frank. For some time past the professor has been worrying himself as to what was to become of me: what business or occupation I was fit for with my peculiar bringing-up—for there is no getting over the fact that it has been peculiar—and the professor, considering himself responsible for it, has been pretty anxious about the result. Now, here is an occupation all laid out for me, and nobody will be so pleased to hear of it as the professor. It will take a burden off his mind; and I'm mighty glad to think it will."

"I see," said I. "I should think you would be: such a fine old fellow as he is. So, then, Dick, it is settled, is it, that we go ahead? What's the first move, then?"

"Why, the first move of all, I think, is to get back to the lake and eat our lunch, and while we are doing so we can consult as to what work to start upon and how to set about it. What time is it, Pedro?"