On Digestive Proteolysis Being the Cartwright Lectures for 1894

Delivered to a gathering of physicians and surgeons in 1894, these lectures offer a concise yet thorough tour of the chemistry behind protein digestion. The opening talk sets the stage by tracing early ideas about gastric action, then moves swiftly to describe the nature of proteolytic enzymes, how they are produced, and the ways temperature, acidity, and other chemicals influence their activity. Listeners are guided through the preparation of pepsin, the classification of proteins, and the intriguing patterns of molecular cleavage that underpin the digestive process.

The second lecture builds on that foundation, focusing on the partnership of pepsin and hydrochloric acid within the stomach. It examines theories of acid formation, the distinction between free and combined acid, and the antiseptic role of gastric juice. By detailing how proteoses and peptones emerge from digestion, the speaker highlights practical methods for detecting and separating these products, inviting further experimental inquiry into the complex chemistry of our own alimentary system.