Juan Bautista Juanini (1636-1691) i Joan d'Alòs i Serradora (1617-1695)

Our work show a typical scientific relatioship in the last years of the XVIIthn century, inside the renovation movement in the science and medicine of these years. The actors of these relationship were the hispanic-italian doctor-surgeon Giovanni Battista Giovannini (or, in spanish, «Juan Bautista Juanini», Milan 1636 - Madrid 1691) and the catalan doctor and university lecturer Joan d'Alòs i Serradora (Moià 1617 - Barcelona 1695). Both live and work in these years intelectually close and became part of the european scientific movement called usually «the Moderns» group, or, in our countries, called «Novatores». Both are friends and developed a personal and scientifc relationship for years. The article show the epistolar manifestation of these relationship and the possible implications for the science and the medicine of the era in Spain and Catalonia