In the past the physician's library was marked by a relatively small number of ponderous texts which covered all medical knowledge. The information explosion has undermined the substantial ($25.00) textbook and brought to the fore the thin, somewhat less expensive book which covers a restricted area in greater depth. The advantages of the light weights is the focusing of more expertise on less subject. The expert is usually a renowned investigator and lucid writer whose insights illuminate the twilight zones of medical science.
Among the most successful of these little books has been the monographs of the Physiological Society of England. Perhaps the clarity of expression in these volumes stems from the country of their origin, which also originated the language we use. At any rate they are lucid, concise, and convey the basic principles of their subject without being superficial. In the gastrointestinal field we have been fortunate in