4 Passim., and more punctually, according to the basted effect of certain footnotes, all of them active in their program of ferreting out small texts of Freud's, prudently left in corners, animal-machines camouflaged in shadows, threatening the security of a space and a logic. Here, in particular, I must presuppose "Freud and the Scene of Writing " (as concerns "The Note on the Mystic Writing Pad," 1925), in Writing and Difference (1966-67); "The Double Session" (as concerns Das Unheimliche, 1919, see especially notes 32, 52, and 67), in Dissemination (1969-72); "Outwork" (as concerns Das Medusenhaupt, 1922, see note 38), also in Dissemination. A note in Positions (1971-72), p. 107 n. 44) announced this reading of the "Seminar on The Purloined Letter," which was first the object of a lecture at the Johns Hopkins University in November 1971.