But in regard corruption is the alteration of those things that are corrupted into that which is contrary to every one of them, let us consider whether it be a true saying, The death of fire is the generation of air. For fire dies like a living creature, being quenched by force or going out of its own accord. Now quenching makes the alteration of it into air more conspicuous. For smoke is a sort of air, or, according to Pindar, a fuliginous vapor and exhalation, lashing the air with steaming smoke. Pind. IV. 112. On the other side, when fire goes out for want of fuel, as in candles, you shall observe a thick and cloudy air ascending from the top of them. Moreover, the vapor steaming from our bodies upon the pouring of cold water after hot bathing or sweating sufficiently declares the alteration of extinguished heat into air, as being naturally opposite to air; whence it follows that the air was at first dark and cold.