That autumn, with its heats and brown fogs and sharp frosts, was the happiest time in Sarah Maitland's life--the happiest time, at least, since those brief months of marriage;--_Blair was in the Business!_ "If only his father could see him!" she used to say to herself. Of course, she had moments of disappointment; once or twice moments of anger, even; and once, at any rate, she had a moment of fright. She had summoned her son peremptorily to go with her to watch a certain experiment. Blair appeared, shrinking, bored, absent-minded, nearly an hour later than the time she had set. That put her in a bad humor to start with; but as they were crossing the Yards, her irritation suddenly deepened into dismay: Blair, his lip drooping with disgust at the sights and sounds about him, his hands in his pockets, was lounging along behind her, and she, realizing that he was not at her side, stopped and looked back. He was standing still, looking up, his eyes radiant, his lips parted with delight. "What is it?" she called. He did not hear her; he stood there, gazing at three white butterflies that were zigzagging into a patch of pale blue sky. How they had come into this black and clamorous spot, why they had left their fields of goldenrod and asters farther down the river, who can say? But here they were, darting up and up, crossing, dipping, dancing in the smoky sunshine that flooded thinly the noisy squalor of the Yards. Blair, looking at them, said, under his breath, in pure delight, "Yes, just like the high notes. A flight of violin notes!" "Blair!" came the impatient voice; "what's the matter with you?" "Nothing, nothing." "I was just going to tell you that a high silicon pig--" "My dear mother," he interrupted wearily, "there is something else in the world than pig. I saw three butterflies--" "Butterflies!" She stood in the cinder pathway in absolute consternation. Was her son a fool? For a moment she was so startled that she was not even angry. "Come on," she said soberly; and they went into the Works in silence.