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 thought proper to the Case in hand; who balances all the Symptoms, and, from past Observations, finds which have been fatal, and which safe; which arise from outward Accidents, and which from the Disease it self: And who thence collects, which ought soonest to be removed, which may be neglected, and which should be preserved or augmented; and thereupon prescribes accordingly.

Now it is evident, that such a Man's Prescriptions may be very valuable, because founded upon repeated Observations of the Phaenomena of all Diseases. And he may form Secondary Theories, which, like Ptolemee's Eccentricks and Epicycles, shall be good Guides to Practice; not by giving a certain Insight into the first Causes, and several Steps, by which the Disease first began, and was afterwards carried on; but by enabling the Physician to make lucky Conjectures at proper Courses, and fit Medicines, whereby to relieve or cure his Patient. And this may be equally successful, whether he resolves every Thing into Hot or Cold, Moist or Dry; into Acids, or Alkali's; into Salt, Sulphur, or Mercury; or into any Thing else. He does not know, for Instance, that Spittle, Bile, and the Pancreatick Juice, are the main Instruments of Di-