Individual Colored Wrappers. Illustrated. Every Volume Complete in Itself. A new series for boys giving full details of radio work, both in sending and receiving--telling how small and large amateur sets can be made and operated, and how some boys got a lot of fun and adventure out of what they did. Each volume from first to last is so thoroughly fascinating, so strictly up-to-date and accurate, we feel sure all lads will peruse them with great delight. Each volume has a Foreword by Jack Binns, the well known radio expert. THE RADIO BOYS' FIRST WIRELESS; Or, Winning the Ferberton Prize. THE RADIO BOYS AT OCEAN POINT; Or, The Message That Saved the Ship. THE RADIO BOYS AT THE SENDING STATION; Or, Making Good in the Wireless Room. THE RADIO BOYS AT MOUNTAIN PASS; Or, The Midnight Call for Assistance. THE RADIO BOYS TRAILING A VOICE; Or, Solving a Wireless Mystery. THE RADIO BOYS WITH THE FOREST RANGERS; Or, The Great Fire on Spruce Mountain. THE RADIO BOYS WITH THE ICEBERG PATROL; Or, Making Safe the Ocean Lanes. RADIO BOYS WITH THE FLOOD FIGHTERS; Or, Saving the City in the Valley. GROSSET & DUNLAP, Publishers, NEW YORK THE RIDDLE CLUB BOOKS By ALICE DALE HARDY Individual Colored Wrappers. Attractively Illustrated. Every Volume Complete in Itself. Here is as ingenious a series of books for little folks as has ever appeared since "Alice in Wonderland." The idea of the Riddle books is a little group of children--three girls and three boys--decide to form a riddle club. Each book is full of the adventures and doings of these six youngsters, but as an added attraction each book is filled with a lot of the best riddles you ever heard. THE RIDDLE CLUB AT HOME An absorbing tale that all boys and girls will enjoy reading. How the members of the club fixed up a clubroom in the Larue barn, and how they, later on, helped solve a most mysterious happening, and how one of the members won a valuable prize, is told in a manner to please every young reader. THE RIDDLE CLUB IN CAMP The club members went into camp on the edge of a beautiful lake. Here they had rousing good times swimming, boating and around the campfire. They fell in with a mysterious old man known as The Hermit of Triangle Island. Nobody knew his real name or where he came from until the propounding of a riddle solved these perplexing questions. THE RIDDLE CLUB THROUGH THE HOLIDAYS This volume takes in a great number of winter sports, including skating and sledding and the building of a huge snowman. It also gives the particulars of how the club treasurer lost the dues entrusted to his care and what the melting of the great snowman revealed. THE RIDDLE CLUB AT SUNRISE BEACH