Intestinal Irrigation: Why, How and When to Flush the Colon is a practical treatise on colonic cleansing, presenting intestinal irrigation as both preventive regimen and therapeutic intervention. Its style is didactic, procedural, and reformist: the title itself announces a tripartite logic of rationale, method, and occasion. The book belongs to the late nineteenth- and early twentieth-century literature of hygiene, hydrotherapy, and "autointoxication," when digestive regularity was often treated as central to bodily and moral health. Alcinous B. Jamison writes from within a medical culture fascinated by sanitation, internal cleanliness, and the management of chronic disorders through disciplined bodily habits. Though modern biographical traces of Jamison are limited, the work suggests an author conversant with the clinical and popular health debates of his time, especially the belief that the colon could become a site of systemic poisoning if neglected. Readers interested in the history of medicine, alternative therapeutics, naturopathy, or the cultural meanings of cleanliness will find this book especially valuable. It should be read less as current medical advice than as a revealing document of its era: a compact, earnest, and historically instructive argument for one of modern health culture's most persistent practices.