It is good to see a second edition of this valuable book to which so many able men have contributed. One wishes for time in which to read it from cover to cover because the many chapters are so full of thought-producing ideas. Every young man who aspires to be a gastroenterologist will do well to read and reread this book. It is particularly valuable because the chapters have been written by men much interested in the subject assigned to each. Today no one, no matter how erudite, could hope to cover the whole field well or authoritatively. There has been so great an increase in knowledge that no one can hope to keep up with the literature even of a specialty such as gastroenterology. Because of this, every research worker, teacher and leader must, to a large extent, specialize within his specialty.
It is good to note fine chapters