At a somewhat earlier date commenced a long series of weekly and monthly periodicals of a more solid character, of which the following list indicates the more important in chronological order: Die Grenzboten (1862), weekly; the Deutsches Museum (1851-1857), of Prutz and Frenzel; Berliner Revue (1855-1873); Westermanns Monatshefte (1856), monthly; Unsere Zeit (1857-1891), beginning as a kind of supplement to Brockhaus's Conversationslexikon; Preussische Jahrbucher (1858), monthly; Deutsches Magazin (1861-1863); Die Gegenwart (1873), weekly; Konservative Monatsschrift (1873), preceded by the Volksblatt fur Stadt and Land (1843) Deutsche Rundschau (1874), fortnightly, conducted upon the method of the Revue des deux mondes; Deutsche Revue (1876), monthly; Nord and Sud (1877), monthly; Das Echo (1882), weekly; Die Zukunft (1882), weekly; Die neue Zeit (1883), weekly; Reclams Universum (1884), weekly; Velhagen and Klasings Monatshefte (1889), monthly; Die deutsche Rundschau (1890), monthly; Die Wahrheit (1893-1897); Kritik (1894-1902); Die Umschau (1897), weekly; Das literarische Echo (1898), fortnightly; Kynast (1898-1899), known later as Deutsche Zeitschrift (1899-1903) and Iduna (1903-1906); Der Turmer (1898), monthly; Die Warte (1900), weekly; Deutschland (1902-1907); Deutsche Monatsschrift (1902-1907); Hochland (1903), monthly; Charon (1904), monthly; Suddeutsche Monatshefte (1904); Der Deutsche (1905-1908); Deutsche Kultur (1905-1908); Arena (1906), monthly; Das Blaubuch (1906), weekly; Eckart (1906), monthly; Die Standarte (1906), weekly; Meirz (1907), fortnightly; Morgen (1907), weekly; Neue Revue (1907), weekly; Internationale Wochenschrift fur Wissenschaft, Kunst, and Technik (1907), weekly supplement to the Minchener allgemeine Zeitung; Wissen (1907), weekly; Unsere Zeit (1907), monthly; Hyperion (1908), bi-monthly; Xenien (1908), monthly; Das neue Jahrhundert (1909), monthly; Die Tat (1909), monthly.
His memoir On the Motion of Hyperion, a New Case in Celestial Mechanics, is in some respects one of his most original researches.
In 1837-1838 several essays of Longfellow's appeared in the North American Review, and in 1839 he published Hyperion: a Romance, and his first volume of original poetry, entitled Voices of the Night.
Hyperion, a poetical account of his travels, had, at the time of its publication, an immense popularity, due mainly to its sentimental romanticism.
With the same instrument, he further detected, on the 19th of September 1848, Hyperion, the seventh of Saturn's attendants, and, on the 24th of October 1851, Ariel and Umbriel, the interior moons of Uranus.
C. Bond identified Hyperion; and he perceived, on the 15th of November 1850, Saturn's dusky ring, independently observed, a fortnight later, by W.