Read it through once

The old gentleman was a very respectable-looking personage, with a powdered head and gold spectacles. He was dressed in a bottle-green coat with a black velvet collar; wore white trousers; and carried a smart bamboo cane under his arm. He had taken up a book from the stall, and there he stood, reading away, as hard as if he were in his elbow-chair, in his own study. It is very possible that he fancied himself there, indeed; for it was plain, from his abstraction, that he saw not the book-stall, nor the street, nor the boys, nor, in short, anything but the book itself: which he was reading straight through: turning over the leaf when he got to the bottom of a page, beginning at the top line of the next one, and going regularly on, with the greatest interest and eagerness.