The Problem of the Nile Flood
For centuries it baffled Greek thinkers: why does the Nile swell and flood in high summer, when no rain falls in Egypt?
Greek natural inquiry returned again and again to a single anomaly: the Nile rises and overflows in midsummer — the opposite of other rivers, and with no local rain to explain it. Herodotus (c. 430 BCE) turned the puzzle into a showcase of reasoned debate, laying out and weighing three rival theories: the etesian winds, an encircling Ocean, and melting snow. The question drew in Anaxagoras, Democritus, and the Aristotelian school, and was effectively solved in antiquity by tracing the flood to heavy summer rains in the Ethiopian highlands. It became a model of how to argue your way toward a natural explanation.
How it traveled
- Geographiae ChrestomathiaAmaseia · 24explains
- Orationes 48Smyrnaexplains
- AethiopicaEmesaexplains
- Naturalis HistoriaRomeexplains
- Life of Apollonius of TyanaAthensexplains
- De Natura AnimaliumRomeexplains
Key passages(20)
Carminum minorum corpusculum · Claudian