Read it through once

Sydney had not gone far out of sight, when he stopped in the middle of the street under a glimmering lamp, and wrote with his pencil on a scrap of paper. Then, traversing with the decided step of one who remembered the way well, several dark and dirty streets--much dirtier than usual, for the best public thoroughfares remained uncleansed in those times of terror--he stopped at a chemist’s shop, which the owner was closing with his own hands. A small, dim, crooked shop, kept in a tortuous, up-hill thoroughfare, by a small, dim, crooked man.