A number of papers have appeared on laryngotracheobronchitis in recent years, almost wholly from otolaryngologic sources. Notable contributions have been made by Chevalier Jackson,<sup>1</sup>Lyman Richards<sup>2</sup>and Sidney Farber, T. R. Gittens,<sup>3</sup>H. L. Baum,<sup>4</sup>D. M. Tolle,<sup>5</sup>A. H. Neffson and S. M. Wishik<sup>6</sup>and others. It has seemed to us worth while to approach and to present this live subject with more regard to a pediatric point of view than has been usual hitherto and to combine the clinical, endoscopic and pathologic aspects of the disease as encountered in a large children's hospital over a number of years. The present report is an attempt at an analysis of our experience with this disease at the Children's Memorial Hospital over a period of ten years, from 1927 to 1936, inclusive. As the mortality has varied all the way from 25 per cent to