A symptom of Malaria is loss of appetite. In Alexander Wilson’s letter it says “had not eat but a few mouthfuls”. This tells us that he was eating very lightly. A symptom of Malaria is mental confusion. In Alexander Wilson’s letter it says “(he) walked backwards and forwards before the door talking to himself”. This informs us that Lewis was not in a right state of mind. A symptom of Malaria is high fever. In the editor’s note in Captain Gilbert Russell’s public statement it says “he had detained Lewis at the fort for his own protection until he was well enough to resume his journey”. This gives us evidence that he was physically sick. Lewis was showing all of these symptoms because he did, in fact have