"on, through street and street,
At the Strozzi, at the Pillar, at the Bridge;
Till, by the time I stood at home again
In Casa Guidi by Felice Church,
Under the doorway where the black begins
With the first stone-slab of the staircase cold,
I had mastered the contents, knew the whole truth
Gathered together, bound up in this book."
To my surprise, when we reached the doorway of the Casa Guidi, Bertha also entered "where the black begins," and began to ascend "the staircase cold."