The author cites a number of word-plays in Hebrew and between Hebrew and other languages occurring in the dreams of Jewish patients in Palestine. Examples of plays on ideas are also given as a transitional form between word-plays and symbolism. This indicates, he believes, that the ideational forms of unconscious thinking are probably not determined by hereditary transmission. He further believes that there are

two strata of the unconscious, one associated with language and one not so associated, the former ontogenetic, the latter phylogenetic.