second figure

…both α and γ (second figure), or else both α and γ are predicated of β (third figure). All syllogisms must fall into one or another of these figures.

…of γ” belongs to the second figure and can be a premise in a second-figure syllogism, and so too “α is universally predicated of everything of which γ is universally predicated” for the third figure. Thus, for example, the following is a prosleptic syllogism in the third figure: “α is…