The literature on the so-called pretuberculous child, the child with juvenile tuberculosis, tracheobronchial adenopathy and occult or latent tuberculosis, has grown in the last decade to such tremendous proportions that it is almost beyond the task of one or even of a group of workers to cover the subject in its entirety. It is no longer necessary to stress the important fact that tuberculous infection starts during early infancy and increases in incidence as age advances, and that from 60 to 80 per cent of children who attain the age of puberty harbor the cause of the disease. That only proportionately few succumb to the ravages of clinical tuberculosis in adult life should not minimize the problem of tuberculosis, since relatively little is known of the factors which determine the future course of tuberculous infection. Whether a tuberculous lymph node located near a blood vessel or bronchus will caseate and