The short text contained on ff. 190-192 of MS 166 is the De malitia complexionis diverse from Galen. This name is specifically that given to the Latin translation of Galen's text. It is a work in which Galen works to classify, based on their causes, the diseases that afflict humankind. This Latin translation seems to be by Gerard of Cremona, although his name is not mentioned in any of the surviving manuscripts of the treatise. Instead, the text was listed by his students after his death as translated by him. By the late 13th century (when MS 166 was produced), the De malitia complexionis diverse was part of the medical curriculum at the University of Paris, and was frequently summarised by medical students as part of their studies.

The text begins on f. 190v with the words Malitia complexionis diverse quandoque...It ends on f. 192r with Deinde post ipsum librum de ingenio sanitatis. Explicit liber Galieni de malicia Complexionis diverse.

In the hand of the second scribe contained in MS 166.