Landsteiner discovers blood groups and makes blood transfusion possible.

Barbiturates introduced as an anaesthetic agent.

Vitamins discovered - Vitamins A, B and E isolated.

Banting and Best show that insulin will reverse diabetes.

Radiation used to treat cancer.

Local anaesthetics are developed.

Antibodies discovered.

The role of the hormone system is described.

Fleming discovers penicillin.

Einthoven introduces the electrocardiograph (ECG).