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 publications devoted to children's urinary tract disease that a full review is no longer possible within the compass of a volume of this size: the decision as to what should be left out has therefore been a matter of the greatest difficulty. The choice has been inevit ably arbitrary and many omissions are regretted. The attempt has been made, however, to report the most notable developments of the subject, and perhaps the greatest change in the practice of paediatric urology has been the full integra tion with paediatric nephrology. The team approach to infant disease in particular has led to greatly improved results. I have been fortunate to have Dr. T. M.
Flammability has been recognized as an increasingly important social and scientific problem. Fire statistics in the United States (Report on the National Commission on Fire Prevention and Control, "America Burning," 1973) emphasized the vast devastation to life and property-12,000 lives lost annually due to fire and these deaths are usually caused by inhaling smoke or toxic gases; 300,000 fire injuries; 11. 4 billion dollars in fire cost of which 2. 7 billion dollars is related to property loss; a billion dollars to burn injury treatment; and 3. 3 billion dollars in productivity loss. It is obvious that much human and economic misery can be attributed to fire situations. In relation to this, polymer flammability has been recognized as an increasingly important social and scientific problem. The development of flame-retardant polymeric materials is a current example where the initiative for major scientific and technological developments is motivated by sociological pressure and legisla tion. This is part of the important trend toward a safer environment and sets a pattern for future example. Flame retardancy deals with our basic everyday life situations-housing, work areas, transportation, clothing and so forth the "macroenvironment" capsule within which "homosapiens" live. As a result, flame-retardant polymers are now emerging as a specific class of materials leading to new and diversified scientific and technological ventures.
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