During 1931-1946, the dominant research thrust centered on gastric secretion physiology and acid-pathology, shaping understanding of ulcers, acid stimulation, achlorhydria, and the effects of radiotherapy on secretion. Parallel work on pancreatic function and digestive enzyme diagnostics—highlighting exocrine pancreatic insufficiency and the link to celiac disease—advanced the GI disease paradigm. Nutritional status and metabolic biomarkers, including vitamin deficiencies and nitrogen balance, emerged as essential tools for characterizing disease impact, while inflammatory and structural GI pathology tied together pathology, neurology, and disease states such as megacolon and pernicious anemia-associated lesions. Influential Works: Notable milestones include a 1938 necropsy-based comparison of gastric and duodenal ulcers that established an anatomical basis for peptic ulcer disease and directed subsequent research; in the same year, work linking exocrine pancreatic insufficiency to malabsorption and celiac disease reframed pancreatic contributions to digestion. A foundational inquiry into gastrin clarified its role in stimulating acid secretion, laying the groundwork for modern gastric physiology. These advances, together with mechanistic insights into gallbladder inflammation and pediatric neurogenic motility disorders described in the period, unified physiology and pathology to guide diagnosis and therapy.