Spain first day cover features a cachet and stamp showing Wilhelm Conrad Roentgen, the discoverer of the X-ray. The stamp was issued to commemorate the first European Congress of Radiology.

**

IV-05 1967 Spain stamp commemorates the first European Congress of Radiology. The stylized portrait of Roentgen is accompanied by a modern X-ray tube and the atomic symbol.

Médecine
3534 : Santiago Ramon y Cajal (histologiste) Prix Nobel en 1906
avec Camillo Golgi (structure du système nerveux)
3535 : Severo Ochoa (biochimiste) Prix Nobel en 1906
avec Arthur Kornberg (mécanisme de la synthèse biologique de l'ADN)