OF PHYSICIANS.

a syndromē concurrence of signs must be collected, which may be said reciprocally both of the disease and of the Remedy. Thus, even common physicians collect a syndromēn of signs. For example, of Pleurisy: then, having collected all the signs, they demonstrate that this affection is Pleurisy. For if only one or another sign is applied, for example, a constant fever or difficult respiration, the demonstration is not established at all. For it is necessary in a demonstration to apply a perfect enumeration of signs, namely one such that it is reciprocal with the cause and with the affection itself. Nor indeed are signs to be gathered in any other way than the mode in which Antecedents and Consequents are gathered and noted in order to establish an Analytic middle, concerning which Aristotle writes in the treatise On Investigating the Principles of All Syllogisms. "One way," he says, "is the same for all things, both regarding philosophy and regarding any art or discipline whatever. For one must [collect] the things that exist, and those to which [they] exist..."