Jaroslav then comments on her interest in and striking knowledge of his family, then asks if she knows the name Makropulos. This startles Emilia, but she then recovers her bearings. Prus reveals the presence of additional documents, including an additional document whose contents he does not know, with a seal from Baron Prus intended for the hands of "his son Ferdinand", which he has never opened. Emilia's interest is again sparked, and she demands that document. Jaroslav asks for a reason, which Emilia does not directly answer. Jaroslav proceeds to ask Emilia what she knows about Ellian MacGregor, whom he describes in disparaging terms, after reading her love letters that detail explicit sexual behaviour. Emilia takes offence at this part of the conversation. Jaroslav then mentions another name, Elina Makropulos, which also startles Emilia. He says that the name registered as the mother of Ferdinand Gregor was Elina Makropulos. Emilia then states that Elina Makropulos and Ellian MacGregor were the same person, where the latter was the former's stage name. Emilia goes on to say that Elina Makropulos was her aunt. Jaroslav is skeptical at this explanation, saying that this explanation would be more credible if Elina Makropulos were her great-grandmother's aunt. He continues saying that only a descendant of Ferdinand Makropoulos can claim the estate. Emilia offers to buy a mysterious document found with the will, but Jaroslav refuses and leaves.
