Awed, and hardly able to believe her eyes, Rilla lifted a truly wonderful garment from the trunk—it was silk—and green, sea-green like the heart of a wave just before its foamy crest curls over in the sun.

It was trimmed with silvery, spangly lace.

“It’s a dress to wear, ’pears like, though thar’s not much to it as yo’ could call sleeves, an’, yo-o! Shagsie, will yo’ look? Here’s slipper things! Soft as the moss on the nor’east side o’ a rock an’ green, wi’ silver buckles.” Then the girl’s excited, merry laughter rang out as she drew forth another treasure. “Don’ tell me yo’ don’ know what this here is, Shagsie,” she chuckled. “Maybe yo’ think it’s a green spider-web, but ’tisn’t; no, sir, it’s got a heel and a toe to it! That’s a stockin’, ol’ dog. Now, who’d——” She paused and listened intently. Ringing clear above the booming crash of the surf she heard her grand-dad calling. Quickly she ran to the opening.

“Rilly gal, tarnation sakes, whar be you? Never seem to be around mess time lately. The kettle’s singin’ like a tipsy sailor and ’bout to dance its cap off.”

“Comin’, Grand-dad,” the girl thrust her head out to reply, in a quieter moment, when a wave was receding; then hastily, but with infinite care, she knelt and smoothed the silken folds of the shimmering green gown, replaced the mirror-lined top, strapped it down and then covered the whole with an old sail cloth which had been one of Rilla’s former stowed-away treasures.

If the girl had been excited the night before, she was much more so this early morning. However, her grand-dad was preoccupied and did not notice the flushed cheeks and eager, glowing eyes of his “fust mate.” Silently he ate his quarter of apple pie, gulped down a huge cup of steaming coffee. It was plain to the girl who watched him that he was thinking of something intently.

Rilla was counting the minutes that would have to elapse before she revisited the cave, when her grand-dad pushed his armchair back from the table and arose.

“Rilly gal,” he peered over his spectacles at the girl, “I’ve got to navigate to town this mornin’. Oil and supplies are gettin’ tarnicky low, ’pears like. Equinoxial storms are due in port mos’ any day now, so we’ll not put the v’yage off any longer. Fust mate, be gettin’ into yer sea-goin’ togs.”

Muriel’s heart sank. “Oh, Grand-daddy, do I have to go?” The piercing grey eyes under shaggy brows turned toward the girl questioningly. Had he heard aright? Could it be his “gal” begging not to be taken to town, when usually it was right the other way.

Then he laughed. “What a suspicious ol’ sea-dog I am,” he ruminated. “Mabbe the gal’s rigged up some new fancy notion down in that cave o’ her’n.” Aloud he said heartily. “All right, fust mate, stay anchored if ye want to. I’m thinkin’ thar’s nothin’ on Windy Island to molest ye. Thar’s the gun in the corner if yer needin’ it, but Shags, here, will protect ye, won’t ye, ol’ skipper?”