The document provides a history of transfusion medicine from ancient times through the 20th century. It describes early beliefs and practices involving blood in various cultures. Key developments include Richard Lower performing the first animal-to-animal blood transfusion in 1665, the first human-to-human transfusion by James Blundell in 1818, Karl Landsteiner's discovery of the four main blood groups in 1900 which enabled safer transfusions, the development of blood banks and preservation/anticoagulation methods enabling long-term blood storage, and the transition to component therapy and plastic blood bags in the 20th century which increased blood supply and safety.