The Secrets of Disease and Health

Fanel thinks that gallen grudgingly had to admit the hidden causes. While some medical phenomena can be explained in crude material terms, many cannot. As with opium, we could never tell just by examining the basic physical properties of a poison that it is lethal. So poison operates in virtue of its total substance, not by any quality manifest to the senses. Similarly, we can hardly explain plagues and epidemics just by talking about things like hot weather. True, some diseases do spike in summer, but then we might have a sweltering summer where no one gets sick. Fernel also concedes that the individual mixture or temperament of a person's body may have something to do with