“…Indirect methods, which began surpassing direct techniques from around 1911, involved drawing blood into graduated metal or glass containers with a cannula syringe (Maluf : 94‐101). In 1915, Richard Lewisohn, a surgeon at the Mount Sinaii Hospital in New York, proposed mixing withdrawn blood with a diluted sodium citrate solution to prevent clotting, an innovation that simplified the technique of blood transfer and allowed surgeons to preserve blood outside the body, clot free, for longer periods (Lewisohn ; Wain ) . In all cases, transfusion involved the issuing of blood from one individual to another at the time of an operation, usually in close, if not immediate, proximity…”