The planets are near, and we know it by their not twinkling, 2 but science must conceive their nearness as the cause of their not twinkling and make the Arius in the real order the middle term of its syllogism.
The phyllites (q.v.) form a middle term between this group and the slates; they consist usually of quartz, white mica and chlorite, and have much of the foliation and schistosity of the mica-schists.
Thus, 1 - x would represent the operation of selecting all things in the world except horned things, that is, all not horned things, and (1 - x) (1 - y) would give us all things neither horned nor sheep. By the use of such symbols propositions could be reduced to the form of equations, and the syllogistic conclusion from two premises was obtained by eliminating the middle term according to ordinary algebraic rules.
Ramus also set the modern fashion of deducing the figures from the position of the middle term in the premises, instead of basing them, as Aristotle does, upon the different relation of the middle to the so-called major and minor term.
It is not enough to have for middle term a causa cognoscendi merely.
The conception of linkage needs to be deepened by the realization of the middle term as the ground of nexus in a real order which is also rational.