Gastroscopy, the endoscopic examination of the interior of the stomach, has finally come of age. Although beset with multiple difficulties, and slow to develop, the method has achieved a sudden flowering in the past 10 years found in few other types of examination of the living human. The advances, the results of great interest and perseverance by many workers in all parts of the world, have been based on the happy combination of these efforts and the rapidly changing manufacture of various instruments to visualize, photograph, and biopsy all parts of the stomach at will. So rapid have been...