 There are thus only two forms that can properly be referred to as logical forms for Jones—identities and their negations. While Jones holds that S is P asserts an “identity of denotation” in “diversity of intension”, S is not P asserts “difference of denotation” in “intensional diversity”. (Even if one accepts the former analysis, however, the latter is problematic. As Augusta Klein (1911) notes, for a statement of the form S is not P to be informative, more is required than the mere “intensional diversity” of S and P. To see this note that, while ‘Horses are not house plants’ gives us a case of “difference of denotation” in “intensional diversity”, it is no more informative than ‘Horses are horses.’ For Klein, the intensions must overlap to a significant degree for the claim of their diversity to have any cognitive value.)