And then it was a beautiful spring morning. From the school windows we could see the blue sky, the trees of the garden all covered with buds, and the wide-open windows of the houses, with their boxes and vases already growing green. The master did not laugh, because he never laughs; but he was in a good humor, so that that perpendicular wrinkle hardly ever appeared on his brow; and he explained a problem on the blackboard, and jested. And it was plain that he felt a pleasure in breathing the air of the gardens which entered through the open window, redolent with the fresh odor of earth and leaves, which suggested thoughts of country rambles.