In common usage, a collection is any group of items that has one or more properties in common. For example, paintings from the same artist, or coins from Germany before 1900, see collecting and collectible.
... Geist (1837; 3rd ed., 1863)
Kritische Erläuterungen des Hegelschen Systems (1840)
Vorlesungen über Schelling (1842)
System der Wissenschaft (1850)
Meine Reform der ...