“…The wide range of bleeding is an invariable feature of all blood loss investigations. It occurs in vaginal surgery (Buchman, 1953;Lazar and Kreiger, 1959;Dillon, 1962;Copenhaver, 1964), prostatectomy (Bodman, 1959), cardiac surgery (Thornton et al, 1963), obstetrics (Wallace, 1967) and paediatrics (Jones, 1962). Hercus and bis associates measured blood loss in 412 major operations.…”