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Brockhaus-1911: Natura non facit saltus
Heiligenlexikon-1858: Saltus, S.
Herder-1854: Saltus aestivus
Kirchner-Michaelis-1907: Natura non facit saltus
Meyers-1905: Saltus in demonstrando
Pierer-1857: Saltus · Hic Rhodus, hic saltus