Oscar Rie had recently given the Freud's a bottle of liqueur, the nasty propyl smell of which had caused Freud to tell his wife to throw it out.
Grinstein suggests of Freud's association to propyl: We may also consider that the element propyl leading to Propylaea could be employed symbolically referring to the anatomical architecture of the female genitals (forecourt, columns, etc.). This would continue the material seen earlier involving the curly structures in Irma's throat (1980, p. 42).