To the Editor.—
As I have been especially interested in primary tuberculosis in adults for several years and recently published an article on the subject, together with Hedvall (Malmros, Haqvin, and Hedvall, Erik: Studien über die Entstehung und Entwicklung der Lungentuberkulose mit besonderer Berücksichtigung des Verlaufs der tuberkulösen Erstinfektion des Jugendlichen und Erwachsenen, Tuberkulose-Bibliothek No. 68, Leipzig, Johann Ambrosius Barth, 1938; reviewed in The Journal, Dec. 17, 1938, p. 2331), may I be allowed to make a few comments in connection with the editorial entitled "Primary Tuberculosis in Adults" in The Journal, July 8, page 146. It concerns the following statement: "Primary infection in adults, other things being equal, appears to be... no more grave than in children" and in addition the following points from page 147, taken from the article of Myers and his co-workers:The first infection type of tuberculosis, as observed in this group of adults, has