English physician who discovered the circulation of blood. In 1628 he published his book De motu cordis/On the Motion of the Heart and the Blood in Animals. He also explored the development of chick and deer embryos.
Harvey's discovery marked the beginning of the end of medicine as taught by Galen, which had been accepted for 1,400 years.
The emblem was added to distinguish the flag from that of Italy. The design is based on the French tricolour. The colours are those of the Mexican liberation army. Effective date: 23 November 1968.