 However, recent work by Wehmeier (1999) suggests that, in §10, Frege was not attempting to restrict the quantifiers of his system to extensions (nor, more generally, to courses-of-values). The extensive footnote to §10 indicates that Frege considered, but did not hold much hope of, identifying every object in the domain with the extension consisting of just that  object.[18]  But, more importantly, Frege later considers cases (in Gg, Sections 34 and 35) which seem to presuppose that the domain contains objects which aren’t extensions. (In these sections, Frege considers what happens to the definition of ‘\( x\) is a member of \(y\)’ when \(y\) is not an  extension.)[19]