An experimental inquiry into the properties of carbonic acid gas or fixed air : its mode of operation, use in diseases, and most effectual method of relieving animals affected by it. : Being an inaugural thesis, submitted to the examination of the Rev. John Ewing, S.T.P. provost; the Trustees and medical faculty of the University of Pennsylvania, on the 12th day of May, 1797. For the degree of Doctor of Medicine. /