Note 2 — Chapter V

172 Dr Venn (Symbolic Logic, p. 432) remarks, “As a whole Lambert’s scheme seems to me distinctly inferior to the scheme of Euler, and has in consequence been very little employed by other logicians.” The criticism offered in support of this statement is directed chiefly against Lambert’s own representation of the particular affirmative proposition, namely,

This diagram certainly seems as appropriate to O as it does to I; but the modification introduced in the text, and indeed suggested by Dr Venn himself, is not open to a similar objection.