'A dialogue of the unspeakable' describes the analytic discourse for what it is, an attempt to speak about what one is not conscious of In this sense I will be writing about what is already established in the relationship between psychoanalysis and language. There will be references made to language in Freud, for example, the talking cure, verbal bridges and the dream work of condensation and displacement. A considerable proportion of this essay will be devoted to Lacan and his specific understanding of linguistic theory in relation to psychoanalysis. Appearing in this part are some familiar concepts such as, metaphor and metonymy, full and empty speech and the division of the subject through language. But this essay is 'a dialogue of the unspeakable' in another sense. I will begin with a discussion and exploration of some aspects of language that have been overlooked by psychoanalysis. These are the fundamental questions about the origins and early development of language. The purpose of this essay is to examine the most recent ideas of language origin and development and determine if psychoanalysis has anything to gain from such ideas. The results may prove fruitless but I am drawn into this investigation by curiosity and by what seems to me to be the reasonable assumption that any new idea about language is potentially of interest to psychoanalysis.