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. Any volume sent postpaid upon receipt of price. HURST & COMPANY--Publishers--NEW YORK MOTOR MAIDS SERIES Wholesome Stories of Adventure By KATHERINE STOKES. Cloth Bound. Illustrated. Price, 50¢. per vol., postpaid [Illustration: Book Cover] THE MOTOR MAIDS' SCHOOL DAYS. Billie Campbell was just the type of a straightforward, athletic girl to be successful as a practical Motor Maid. She took her car, as she did her class-mates, to her heart, and many a grand good time did they have all together. The road over which she ran her red machine had many an unexpected turning,--now it led her into peculiar danger; now into contact with strange travelers; and again into experiences by fire and water. But, best of all, "The Comet" never failed its brave girl owner. THE MOTOR MAIDS BY PALM AND PINE. Wherever the Motor Maids went there were lively times, for these were companionable girls who looked upon the world as a vastly interesting place full of unique adventures--and so, of course, they found them. THE MOTOR MAIDS ACROSS THE CONTINENT. It is always interesting to travel, and it is wonderfully entertaining to see old scenes through fresh eyes. It is that privilege, therefore, that makes it worth while to join the Motor Maids in their first 'cross-country run. THE MOTOR MAIDS BY ROSE, SHAMROCK AND HEATHER. South and West had the Motor Maids motored, nor could their education by travel have been more wisely begun. But now a speaking acquaintance with their own country enriched their anticipation of an introduction to the British Isles. How they made their polite American bow and how they were received on the other side is a tale of interest and inspiration. Any volume sent postpaid upon receipt of price. HURST & COMPANY--Publishers--NEW YORK