It's 'in those days'.. specifying those days as in the past.
Hawthorne's best known novel is 'The Scarlet Letter.' The Scarlet Letter was made in 1850.
The word said is less precise
whispered is more precise
eamed is precise
made is less precise
outgoing is more precise
nice is less precise
home is less precise
mansion is more precise
She was chosen by the committee to lead the parade.
This is a quote from "The Secret Life of Walter Mitty", and it is a made-up term. He is not a skilled surgeon, so he made up the term obstreosis (a word that does not even exist), duct is like a passage, the same way as tract. So this "disease" makes no sense and does not exist.