A dissertation on the mutual influence of habits and disease : Submitted as an inaugural thesis, to the examination of the Reverend John Andrews, D.D. provost, (pro tempore), the trustees and medical faculty of the University of Pennsylvania, on the fifth day of June, 1804. For the degree of Doctor of Medicine. / - Darlington, William, (Printed for the author, by Joseph Rakestraw, no. 95, North Third Street,, 1804)