LessonsDemonstration Through Causes and Effects: Limmī and InnīQuiz

زيد متعفن الأخلاط لأنه محموم، وكل محموم متعفن الأخلاط، فزيد متعفن الأخلاط
Zayd has corrupted humors because he has a fever; in the classical account assumed here, every feverish person has corrupted humors, so Zayd has corrupted humors.

Now fever is the middle term. Within that theory, fever is considered an effect, not the cause, of corruption of the humors. It may therefore be used as a sign for knowing the cause without producing that cause.

The illustration is historical and is not a diagnostic rule for contemporary medicine.

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The textbook example of innī

Demonstration Through Causes and Effects: Limmī and Innī

زيد متعفن الأخلاط لأنه محموم، وكل محموم متعفن الأخلاط، فزيد متعفن الأخلاط
Zayd has corrupted humors because he has a fever; in the classical account assumed here, every feverish person has corrupted humors, so Zayd has corrupted humors.

Now fever is the middle term. Within that theory, fever is considered an effect, not the cause, of corruption of the humors. It may therefore be used as a sign for knowing the cause without producing that cause.

The illustration is historical and is not a diagnostic rule for contemporary medicine.