INTRODUCTION
The results in general of the treatment of pulmonary tuberculosis are most encouraging. It is said to be the most curable of all chronic diseases, and many autopsy statistics are quoted to prove that even under the most unfavorable conditions healing occurs in a large proportion of those affected. There are to-day few physicians of large experience who have not repeatedly observed the healing of pulmonary tuberculosis. In the mind of the laity the former pessimistic view is gradually waning, and in many instances is replaced by the belief that every case of tuberculosis is curable. Some physicians of wide experience even go so far as to say that every case of non-acute pure pulmonary tuberculosis is curable. Neither of these statements, however, can stand in the light of our present knowledge. It is an easy task so to improve the general condition of a patient as to give