The three plays of Florencio Sanchez, M'hijo el dotor(1903), La gringa(1904), and Barranca abajo(1905) are considered the rural trilogy of Florencio Sanchez. His prime concern was the portrayal of social-moral conflict in his society of 19th and 20th century. Barranca abajo, is about Don Zoilo, an aging rural patriarch, who loses his estate because of the corrupt exploitor of modernity. After the lose of property, came the desintegration of the family and this and several other factors push him toward the suicide. This article analyzes in detail the reasons that push him to take the tragic and fatal decision. The suicide of don Zoilo not only means the end of an old creole, but the symbol of the disappearance of the myth of gaucho.