§ 250
When, to the observant practitioner who accurately investigates the state of the disease, it is evident, in urgent cases after the lapse of only six, eight or twelve hours, that he has made a bad selection in the medicine last given, in that the patient’s state is growing perceptibly, however slightly, worse from hour to hour, by the occurrence of new symptoms and sufferings, it is not only allowable for him, but it is his duty to remedy his mistake, by the selection and administration of a homoeopathic medicine not merely tolerably suitable, but the most appropriate possible for the existing state of the disease (§ 167).