How does Timsen treat Marlowe's arm in Chapter 21?

Timsen gives Marlowe – who is barely conscious – a shot of morphine and removes the bandage. He cuts away the rotted flesh on Marlowe’s arm, then cleans the wound and sprinkles sulfa powder on it. He re-bandages the arm and has the King watch as he gives Marlowe an intravenous injection of antitoxin.