(a) These words are said by Watson to Holmes when Mary Morstan had left after discussing her case. Watson is attracted to her and full of admiration for her. When he voices his admiration, Holmes says that he had not noticed if she is attractive or not. Watson is indignant and calls him a calculating machine.
(b) These are the words of Holmes to Watson, when they are discussing the letter that Mary Morstan has received from an unknown person. He wondered what was the ‘justice’ that the letter spoke of, and who had done ’ something wrong to Mary that she now needed justice.
(c) These words are said by Holmes to Watson and Mary Morstan, when they are being driven by the coachman to some strange place. They were going through narrow streets in an unfriendly and grim neighbourhood, which had dull brick rows of houses and cheap and showy public houses at the comer. Holmes mentions that this was not a very fashionable or rich neighbourhood.
