Letter on the Deaf and Dumb

Letter on the Deaf and Dumb, for the Use of those who hear and speak (French: Lettre sur les sourds et muets a l'usage de ceux qui entendent et qui parlent) is a work by Denis Diderot containing a psychological investigation on the deaf-mute. It was published in 1751. It was meant to be a companion volume to Diderot's Letter on the Blind.

Content

The book consists of an enquiry into the method of communication used by deaf-mutes, and seeks to shed light on the origin of language by observing the gestures, and response to gestures, of deaf-mutes.[1][2]

gollark: Clearly, my purchase of a GT 710 several years ago because I needed something which would technically work as a GPU was very foresighted.
gollark: For example, you can call people "utterly isomorphic to the group of integers modulo 7" or "literally made of pentavalent carbon".
gollark: The best insults are ones which are not actually recognizable in any way as insults.
gollark: Is the US not attempting to develop similarly ææææ laws?
gollark: Anyway, it doesn't really matter if Signal is still extant if you can't download it easily (or at all on iPhones) and the backend servers are blocked (which the bill also gives the communications regulator the power to do...).

References
  1. Will Durant (1965). The Story of Civilization Volume 9:The Age of Voltaire. Simon&Schuster. p. 633.
  2. P.N. Furbank (1992). Diderot:A Critical Biography. Alfred A. Knopf. pp. 64–5.
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