3. A Young Knight Errant; OR, CRUISING IN THE WEST INDIES. 4. Strange Sights Abroad; or, ADVENTURES IN EUROPEAN WATERS. No author has come before the public during the present generation who has achieved a larger and more deserving popularity among young people than "Oliver Optic." His stories have been very numerous, but they have been uniformly excellent in moral tone and literary quality. As indicated in the general title, it is the author's intention to conduct the readers of this entertaining series "around the world." As a means to this end, the hero of the story purchases a steamer which he names the "Guardian Mother," and with a number of guests she proceeds on her voyage.--_Christian Work, N. Y._ All-Over-the-World Library. By OLIVER OPTIC. Second Series. Illustrated. Price per volume, $1.25. 1. American Boys Afloat; OR, CRUISING IN THE ORIENT. 2. The Young Navigators; OR, THE FOREIGN CRUISE OF THE "MAUD." 3. Up and Down the Nile; OR, YOUNG ADVENTURERS IN AFRICA. 4. Asiatic Breezes; OR, STUDENTS ON THE WING. The interest in these stories is continuous, and there is a great variety of exciting incident woven into the solid information which the book imparts so generously and without the slightest suspicion of dryness. Manly boys will welcome this volume as cordially as they did its predecessors.--_Boston Gazette._ All-Over-the-World Library. By OLIVER OPTIC. Third Series. Illustrated. Price per volume, $1.25. 1. Across India; OR, LIVE BOYS IN THE FAR EAST. 2. Half Round the World; OR, AMONG THE UNCIVILIZED. 3. Four Young Explorers; OR, SIGHT-SEEING IN THE TROPICS. 4. Pacific Shores; OR, ADVENTURES IN EASTERN SEAS. Amid such new and varied surroundings it would be surprising indeed if the author, with his faculty of making even the commonplace attractive, did not tell an intensely interesting story of adventure, as well as give much information in regard to the distant countries through which our friends pass, and the strange peoples with whom they are brought in contact. This book, and indeed the whole series, is admirably adapted to reading aloud in the family circle, each volume containing matter which will interest all the members of the family.--_Boston Budget._ The Blue and the Gray--Afloat. By OLIVER OPTIC. Six volumes. Illustrated. Beautiful binding in blue and gray, with emblematic dies. Cloth. Any volume sold separately. Price per volume, $1.50. 1. Taken by the Enemy. 2. Within the Enemy's Lines. 3. On the Blockade. 4. Stand by the Union. 5. Fighting for the Right. 6. A Victorious Union. The Blue and the Gray--on Land. 1. Brother against Brother. 2. In the Saddle. 3. A Lieutenant at Eighteen. 4. On the Staff. 5. At the Front. 6. An Undivided Union.