I never realized that Mr.Jones and Mr.Perry weren´t physicians either. It might perhaps be due to the fact that I have to rely on German translations to read Austen. Although in this case the translation actually did mention an apothecary it said in the sentence I cited that the boy had a collar-bone fracture! It was only through the Pemberley pop-up novel text that I realized it was a dislocation only - which made much more sense.