ABSTRACT
Blood transfusion was first practised on a large scale during the war. Since then it has been carried out in tens of thousands of cases. Not only can it be used to combat loss of blood from wounds, childbirth, or operations. This country people are still apt to regard blood donors as heroes, though most healthy men can give a quart of blood and return to work next day. Later Jansky and Moss showed that as regards these properties of the blood every human being falls into one of four groups. As a general rule the blood from a member of group 4 can safely be transfused into any one, from group 3 only into groups 1 and 3, from group 2 only into groups 1 and 2. Thus the unfortunate members of group 4, to which I belong, can be called on to give blood to any one, while the blood of most other people is poisonous to them.
