AS THE mortality of lobectomy for unilobar bronchiectasis has declined to a present level which seems almost incredibly low (less than 1 per cent in a recently reported series) the indications for the operation have been extended to include two types of cases which in the past were rejected; namely, (1) cases of minimal disease with symptoms not troublesome enough to warrant any considerable risk of operation, and (2) cases of diffuse disease, with involvement of both lungs or of both the upper and the lower lobe of one lung. This paper is not concerned with cases of the first type, those of minimal disease; suffice it to state that radical curative treatment is justified in such cases in anticipation of the inevitable progress of the disease, with increasingly distressing symptoms and with probability of considerable shortening of the life expectancy. In cases of the second type, those of multilobar