Abstract
The characteristic trait of the doctor's medical activity, compared with the quack's, is that the doctor is guided by two theoretical and practical postulates. The first one is diagnostic, and implies that the doctor must try to state the nature of the disease. If this is not possible, he must at least make an analysis of the symptoms in order to establish their patho-physiological connection, so that he knows which are the most important and most susceptible to treatment.

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