Bad luck it brought to an artist who drew pictures of birds; and when he knew what had happened, a sudden light flamed in his eyes. The name of this light is anger--the kind that comes when harm has been ruthlessly done to the weak and helpless. For the artist had climbed the ladder many a time, and had laid his quiet hand upon the lower curve of the nest while Eve and Petro went on with their building at the upper edge. And he had seen the colors of their feathers and the shape of the pale crescent on their foreheads--the mark a man named Say had noticed many years before, when he named this swallow in Latin, _lunifrons_, because _luna_ means moon and _frons_ means front. And he had hoped to climb the ladder many a time again, and when there should be young in the nest, to see how they looked and watch what they did, so that he could draw pictures of the children of Eve and Petro. Bad luck it brought to a writer of bird stories; and when she knew what had happened, something like an ache in her throat seemed to choke her, something that is called anger--the kind that comes when harm is done to little folk we love. For she had climbed the ladder many a time, and had rested her head against the top while she watched Eve and Petro push the pellets of mud from their mouths with their tongues and bunt the wall of their clay nest smooth on the inside with the top of their closed beaks, not stopping even though they brushed their pretty chestnut-colored cheeks against the sticky mud, or got specks on the feathers of their dainty foreheads that bore a mark shaped like a pale new moon. And she had hoped to climb the ladder many a time again, and watch Eve and Petro feed their children when the nest was done and lined and the eggs were laid and hatched; for this nest could be looked into, as the top was left open because the barn roof sheltered it and it needed no other cover. Now Eve and Petro were gone, and no more sketches could be made near enough to show how little cliff swallows looked in their nest. And nothing more could be written about such affairs of these two birds as could only be learned close to them. Nor, indeed, was there any way to learn those things from the rest of the colony; for it so chanced that Eve and Petro were the only pair who had built where a ladder could be placed. So bad luck had come not only to Eve and Petro, but to the story of their lives.