Ce que voyant. Seeing which

26. entr’ouvrit. The prefix entre usually adds the meaning ‘one another’ to a verb, as in entr’aider, but in entr’ouvrir and entrevoir it means partly.

30. il, there, the impersonal subject anticipating the logical subject lumière.

Page 32. — -11-12. Mademoiselle ... davantage. An observation worth noting.