Answer
Henry Hallett Dale passed away on July 23, 1968. He was a renowned pharmacologist and physiologist who made significant contributions to the field of neuropharmacology. Throughout his career, Dale conducted extensive research on the chemical transmission of nerve impulses, specifically focusing on the actions of acetylcholine and histamine. His groundbreaking discoveries paved the way for future advancements in understanding the mechanisms underlying neurotransmission and the development of therapeutic interventions.