Page:Air Service Boys Flying for France.djvu/197

192. Suddenly the plane which was serving Jack as a guide seemed to be swallowed up in a cloud, for he could no longer discern it ahead.

"Gee, that's strange!" he muttered. "What became of it?"

As they had not ascended it became apparent that the clouds were scurrying along at a much lower level than before. This seemed to indicate that a storm was gathering in the levels closer to the earth.

Tom sent his machine higher, hoping to get above the clouds and perhaps find others of the raiding force. Not another airship was in sight, and even in this higher level the clouds gathered about them.

The two air service boys were lost in the upper air currents.