 It is tempting to interpret the Logic as providing a precursor of contemporary semantic theories in which comprehension is like meaning or Fregean sense and extension is like reference. The comprehension of a term does usually determine the objects in its extension. It must be remembered, however that it is psychological ideas and not words that have comprehensions. No ideas are identically shared among minds, so only in the case of innate ideas or complexes strictly defined in terms of innate ideas can communication result in something like transmission of meanings in the modern sense. Hacking (1975) argues that seventeenth-century texts, including the Logic, are primarily concerned with mental discourse and do not include a philosophy of language at all.