Holmes is confronted by the very angry Dr. Roylott. Although the raging man demands his attention and wants to verbally assault him, Holmes is very calm, smiling and more or less ignoring everything that he says, encouraging him to close the door on his way out.
What he learns from the visit is that the Doctor is a very violent man, prone to outbursts of temper.
"I am a dangerous man to fall foul of! See here." He stepped swiftly forward, seized the poker, and bent it into a curve with his huge brown hands.
"See that you keep yourself out of my grip," he snarled, and hurling the twisted poker into the fireplace he strode out of the room." (Doyle)
Holmes then goes on a journey in search of information about the Doctor, he researches the will of his late wife and discovers the terms regarding the two daughters, Julia, who died two years ago and Helen, Holmes client.
It appears that upon their marriages, each girl was to draw an income from an inheritance put aside for her.
"The total income, which at the time of the wife's death was little short of 1100 pounds, is now, through the fall in agricultural prices, not more than 750 pounds. Each daughter can claim an income of 250 pounds, in case of marriage."