Volume XV "Urology in Childhood" was written in 1956/57 and was the first in the series of the Encyclopedia of Urology to appear. This present volume has been constructed as a supplement and the original intention was to deal only with those subjects in which there have been significant advances during the intervening sixteen years. As the work has proceeded, however, it has become evident that there is no aspect of paediatric urology which has not been developed, and no topic which has not been illuminated by many contributions to the literature. Indeed, there has been such a copious flow of...