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).
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Of his numerous writings, the following may be mentioned:
Philosophical
Kritik der Schleiermacherschen Glaubenslehre (1836)
Psychologie oder Wissenschaft vom ...