Final answer:
Mr. Lorry carefully approaches Dr. Manette's condition by discussing a third party's similar situation instead of directly addressing the doctor's own issues, thus avoiding upsetting Dr. Manette.
Step-by-step explanation:
Mr. Lorry approaches Dr. Manette's condition with great delicacy and indirectness. When discussing potential treatments and symptoms, Mr. Lorry hypothetically refers to a third party affected by similar circumstances as Dr. Manette's. One clear method Mr. Lorry uses is by asking what the doctor would prescribe to someone with 'such and such' symptoms, thereby not directly confronting the doctor about his own condition. This approach is gentle and does not upset Dr. Manette, but rather involves him in a professional conversation that touches upon his condition without direct attribution.