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24 ize the bushes for cover, they sprang to their feet and ran. Jack fully anticipated hearing other shots—yes, and perhaps having more leaden missiles singing their vicious songs about his head. But he was agreeably disappointed in his expectations, for not a report came.

Evidently the spy had gone away, thinking discretion the better part of valor. He may have noticed that they were in uniform, and armed in the bargain.

Later on the air service boys moderated their mad pace, and as there seemed to be no further signs of danger they finally fell into a walk. Still neither of them lagged, but kept up a brisk pace, Jack casting numerous apprehensive glances over his shoulder, haunted by a lingering suspicion that the spy might yet give them trouble.

They came through safely at last. The villa in which the American fliers were quartered was reached, and seemed to be deserted at that hour in the afternoon. Everybody must be busy at the front, the boys concluded, for the din was more distracting than usual.

"We picked out a bad day for getting off, I'm afraid, Tom," Jack sighed. "They told us there was nothing big in prospect; but since we started out on our hunt I guess the Huns have put up something of size. And the boys