For the body becoming dry (the freshest element in it becoming evaporated) and being overheated, dry ophthalmia must necessarily ensue owing to solidification; but because the remaining humours are full of bile and these become overheated, acute fevers must ensue caused by the bile, which is undiluted, and in some cases madness, where black bile is naturally present; for the black bile comes to the surface as the contrary humours are dried up.