In this story real dangers threaten and the boys’ patriotism is tested in a peculiar international tangle. The scene is laid on the South American coast.

THE DREADNOUGHT BOYS ON A SUBMARINE.

To the inventive genius—trade-school boy or mechanic—this story has special charm, perhaps, but to every reader its mystery and clever action are fascinating.

THE DREADNOUGHT BOYS ON AERO SERVICE.

Among the volunteers accepted for Aero Service are Ned and Herc. Their perilous adventures are not confined to the air, however, although they make daring and notable flights in the name of the Government; nor are they always able to fly beyond the reach of their old “enemies,” who are also airmen.

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HURST & COMPANY Publishers nbsp; NEW YORK


FRANK ARMSTRONG SERIES