"Of what did the duumvirate deliberate during their itinerary?

Music, literature, Ireland, Dublin, Paris, friendship, woman, prostitution, diet, the influence of gaslight or the light of arc and glowlamps on the growth of adjoining paraheliotropic trees," (U17.11)

This PC of Rathmines Rd shows a gaslight lamppost on the left side of the street, and electric light on the right.