Book 3 — Chapter V
Arthur John Brock translation
Chapter V
If attraction and elimination always proceeded pari passu, the content of these hollow organs (including gall-bladder and urinary bladder) would never vary in amount. A retentive faculty, therefore, also logically needed. Its existence demonstrated. Expulsion determined by qualitative and quantitative changes of contents. “Diarrhoea” of stomach. Vomiting.