There was an abused note in Sissy's voice that deceived her sister. In the perennial game of "bluff" these two played, each was alert to detect a weakness in the other; and Irene thought she had found one now. Ignoring her professor, she placed "In Sweet Dreams" on the rack before her, and gaily and loudly, and very badly, began to play. Sissy rose majestically. Her correct ear was outraged, her small mouth was shut tight. Without a word she resigned her post and made for the door. She had quite reached it before Split capitulated. "Play it, then, you mean thing," she cried, flouncing off the stool, "if it's going to do you any good!" Sissy hardened. She had a way of becoming adamant on rare occasions that really struck terror to Split's facile soul, which resented a grudge promptly and as promptly forgot all about it. "I don't care to play it," said Sissy, loftily. "Well--I want you to--now." [Illustration: "'Play it, then, you mean thing,' she cried, ... 'if it's going to do you any good!'"] "But I don't want to." "Ain't you going to give me my lesson, then?" demanded Split, hoarsely. "I thought you were so anxious to help me!" Sissy was mute. Hers was a strong position, she felt. "D' ye expect me to get down on my knees?" Irene's wrathful voice rose, and her unstable temper rocked threateningly. A Madigan would willingly have been flayed alive rather than apologize in so many words. "I don't expect anything at all," remarked Sissy, coldly. "Well, you'd better expect, for"--with a swift motion that cut off her sister's retreat and put her own back to the door--"you'll play that piece before you go out of this room." Without a word Sissy plumped down on the floor. Unconcernedly she pulled her jackstones out of her pocket, and soon their regular click-clock and the deft thump of her small, fat fist was all that was heard in the room. It always seemed to Split that the last occasion of a disagreement between herself and the sister nearest to her in years, and furthest from her in temperament, was the most intolerable. Never in her life, she thought, had she so longed to murder Sissy as at this minute. She--Split--had no time to waste besieging the impregnable fortress of Sissy's mulishness, when the hardening process had really set in. There never was time enough on Saturdays to do half what one planned, and to-day was the day of Crosby Pemberton's party, besides. And still Split remained at the door, and still Sissy played jackstones. Twice there were skirmishes between besieger and besieged--once when Split crept upon Sissy and, with a quick thrust of her slim, straight leg, disarranged an elaborate scheme for "putting horses in the stable," and once when there was a strategic sortie from Sissy, which failed to catch the enemy napping.