Ternary, and quaternary, consist of three and four elements.
But opinion is the ternary; for that rationally follows from comprehension.
At the last-mentioned point, the ternary salt with 8H2O is formed.
When two combinations are observed, they must be presumed to be a binary and a ternary.
Note the ternary movement of this song, and see Versification, p. lxxiii.