Critical reflection and revaluation of the modern age coalesced into an outlook popularized as ``postmodernism`` in the latter half of the twentieth century. ``Modern project`` viewing history as the triumphant progress toward a utopian society, was based on the newly-formed concept of the human subject in the Age of Enlightenment, that is, the free, rational subject. So critiques of ``modernity`` includes the skepticism about the idea of the modern subject. The opponents of ``modernity`` contend that in historical reality, the modern subject turns out to be partial and oppressive, identifying itself with white, western, middle-classed male and excluding, and subjugating others. So they insist on the necessity of the destruction of the limited concept of modern subjectivity and the creation of a new concept of subjectivity, including the hitherto neglected parts. This paper examines some of Melville`s works in relation to the issue of modern subjectivity. His novels prefigure our age`s doubt about Cartesian subject viewing the others only in terms of I-It relations and show incessant efforts to rebuild a new kind of self which overcomes the limitations of modern subjectivity. Faced with the circumstances that no sooner is a new notion of identity proposed than it is incapacitated, fettered and nullified by the repressive social forces, Melville moved on and on to the next stage, experimenting with a new idea of selfhood. Finally, Melville proposes subjectivity conceived of as something neither totally self-constituting, nor fully socially-constituted; neither absolute nor arbitrary; both refusing the rigid Cartesian categorization of subject-object, and also rejecting the ``postmodern`` fragmentation and dissolution of self. I think this concept of self, both constituting and constructed, and mutually dependent and supporting, like ``Siamese twins,`` sheds meaningful light on our current groping for a post-Cartesian theory of subjectivity.