§ 91
The symptoms and feelings of the patient during a previous course of medicine do not furnish the pure picture of the disease; but on the other hand, those symptoms and ailments which he suffered from before the use of the medicines, or after they had been discontinued for several days, give the true fundamental idea of the original form of the disease, and these especially the physician must take note of. When the disease is of a chronic character, and the patient has been taking medicine up to the time he is seen, the physician may with advantage leave him some days quite without medicine, or in the meantime administer something of an unmedicinal nature and defer to a subsequent period the more precise scrutiny of the morbid symptoms, in order to be able to grasp in their purity the permanent uncontaminated symptoms of the old affection and to form a faithful picture of the disease.