The large number of case reports of lung and bronchial neoplasms which have appeared in the literature in the last two years gives evidence of a renewed interest in this subject. Two factors have served to draw attention to its importance. There has been a growing realization of the fact that bronchial and pulmonary carcinomata are by no means as rare as was once thought, and the developing possibilities of intrathoracic surgery have made their early diagnosis a matter of more than scientific curiosity. It is hoped that the analysis of a large number of carefully selected cases of primary carcinoma of the larger bronchi will aid in forming a definite clinical picture for this condition and in taking it out of the mixed group of lung and bronchial neoplasms in which it has usually been considered. Even Adler,1 who has written the most extensive of the recent