Note: Australia is generally considered to be a continental landmass, rather than an island. If however one does count Australia among the islands it, not Greenland, would be the largest in the world (unless one also considered Antarctica an island).
... (1839-47)
Neue Studien (1875-78).
He published also an autobiography entitled Von Magdeburg nach Königsberg (1873), which deals with his life up to the time ...