With the essay "Consequences of the notion 'existence'", presented in 1976 by the philosopher Constantino Láscaris in the Sixth National Seminar on Demography, the electronic journal "Población y Salud en Mesoamerica" opens the section named Archive with the aim of rescuing for the readers documents, with historical value, on demography and health
Keywords: Existencialism, birth control, phylosophical aspects