The poem that Katharine Hepburn's character recites while riding in the horse buggy with Paul (Carl Esmond's character) is Sir William Watson's "Song" (1897). Ms. Hepburn's character, however, misquotes the line from the poem. She says, "April, April, with her girlish laughter." The lines she is quoting actually appear in the poem as, "April, April, / Laugh thy girlish laughter."
This was an adaptation of a Broadway play starring Katharine Hepburn. The stage production opened at the St. James Theatre in New York on Nov. 10, 1942 and ran for 113 performances.