watched Beth; and, after many conflicting conjectures, finally settled upon one which seemed to explain the change in her. A slight incident gave Jo the clue to the mystery, she thought, and lively fancy, loving heart did the rest. She was affecting to write busily one Saturday afternoon, when she and Beth were alone together; yet, as she scribbled, she kept her eye on her sister, who seemed unusually quiet. Sitting at the window, Beth's work often dropped into her lap, and she leaned her head upon her hand, in a dejected attitude, while her eyes rested on the dull, autumnal landscape. Suddenly some one passed below, whistling like an operatic black-bird, and a voice called out,—
"All serene! Coming in to-night."
Beth started, leaned forward, smiled and nodded, watched the passer-by till his quick tramp died away, then said softly, as if to herself,—
"How strong, and well, and happy that dear boy looks."
"Hum!" said Jo, still intent upon her sister's face; for the bright color faded as quickly as it came, the smile vanished, and presently a tear lay shining on the window-ledge. Beth whisked it off, and glanced apprehensively at Jo; but she was scratching away at a tremendous rate, apparently engrossed in "Olympia's Oath." The instant Beth turned, Jo began her watch again, saw Beth's hand go quietly to her eyes more than once, and, in her half-averted face, read a tender sorrow that made her own eyes fill. Fearing to betray herself, she slipped away, murmuring something about needing more paper.
"Mercy on me; Beth loves Laurie!" she said, sit-
