six o’clock
Callay ! '' He chortled in his joy . ' POLLY 'S birthday dawned auspiciously . At six o'clock she was kissed out of a sound sleep by Bell and Margery , and the three girls slipped on their wrappers , and prepared to run through the trees for a morning plunge in Mirror Pool . Although it was August there was still water enough in Minnehaha Brook to give one a refreshing dip . Mirror Pool was a quarter of a mile distant and well guarded with rocks and deep hidden in trees ; but a little pathway had been made to the water 's edge , and thus the girls had easy access to what they called The Mermaid 's Bath . A bay-tree was adorned with a little redwood sign , which bore a picture of a mermaid , drawn by Margery , and below the name these lines in rustic letters : -- ` A hidden brook , That to the sleeping woods all night Singeth a quiet tune . '