1. +Up the Baltic+; or, Young America in Norway, Sweden, and Denmark. 2. +Northern Lands+; or, Young America in Russia and Prussia. 3. +Cross and Crescent+; or, Young America in Turkey and Greece. 4. +Sunny Shores+; or, Young America in Italy and Austria. 5. +Vine and Olive+; or, Young America in Spain and Portugal. 6. +Isles of the Sea+; or, Young America Homeward Bound. "OLIVER OPTIC is a _nom de plume_ that is known and loved by almost every boy of intelligence in the land. We have seen a highly intellectual and world-weary man, a cynic whose heart was somewhat embittered by its large experience of human nature, take up one of OLIVER OPTIC's books, and read it at a sitting, neglecting his work in yielding to the fascination of the pages. When a mature and exceedingly well-informed mind, long despoiled of all its freshness, can thus find pleasure in a book for boys, no additional words of recommendation are needed."--_Sunday Times_. LEE AND SHEPARD, BOSTON, SEND THEIR COMPLETE CATALOGUE FREE. * * * * * * * * * * * * * * Errata Noted by Transcriber: Invisible punctuation has been silently supplied, and superfluous quotation marks removed. Inconsistent hyphenation has been retained. The spelling "cockswain" is standard for this text. The variation between "knots" and "knots an hour" is as in the original. "_Demandez un garcon_" (ask for a waiter), "Christophe." _cedilla missing in original_ and your wonderful skill as a detective _text reads "wonderful-skill"_ he could not breathe as freely as usual _text reads "breath"_ There was a port light to the room _so in original: "porthole"?_ the commander of that steamer _text reads "of of" at line break_ I heard the villanous ruffian swear that he would kill you _spelling "villanous" as in original_ "Do you know of any steamers ..." asked Christy. _entire paragraph as in original_ He knew that three of them had been secured _text reads "know"_ All of them had removed _text reads "of of"_