Galen: On the Natural Faculties by Galen

Chapter V

47 words  |  Chapter 35

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.