A discourse concerning fevers. [electronic resource] : In two letters to a young physician. the First, Dissuading from all Hypotheses and Theories, whether Physical or Mechanical, as vain and delusive. The Second, Directing his Regimen for the Cure, and his Conduct to the sick Person; With some short, but general remarks upon the pulse and urine, in the Way of Postscript. As also upon the crises, and critical days in fevers.