Sign of the four quotes

Watson describing Holmes

"Hawk like features"

Sherlock's method

"When you eliminate the impossible, whatever remains, however improbable, must be the truth?"

Watson quotes

"She was a unit, a factor-nothing more." He was quoting Sherlock, "a mere unit, a factor in a problem"

Watson quote about him and Mary Simile

"We stood hand-in-hand like two children"

Links to British class system Repetition of "weak" emphasises how he feels about him self.

"What was I, an army surgeon with a weak leg and a weaker banking account."

Watson describing Holmes

"He was bright, eager and in excellent spirits, a mood in which his case alternates with the blackest depression"

Sherlock

"I never remember feeling tired by work, though idleness exhausts me completely."

Sherlock Holmes

"My mind' he said 'rebels at stagnation. Give me problems, give me work."

Watson declining sherlocks offer of cocain

"No indeed' I answered brusquely."

Sherlock

"On which the dead man very considerately got up and locked the door from the inside"