Before the publication of the Gazeta de Buenos-Ayres, early printed periodical publications in Buenos Aires are not simultaneous; therefore, mutual references are scarce. We analyze here the brief exchange that took place between the Telégrafo Mercantil number before the last and the first ones of the Semanario de Agricultura, Industria y Comercio. This exchange was about the characteristics of the local population. A critical article has probably been the reason for Telégrafo's cancellation; the answer in the Semanario was polemics and parody.Antes de la Gazeta de Buenos-Ayres, las publicaciones tempranas de la prensa periódica porteña no salen de modo simultáneo, por lo que son escasas las referencias entre las distintas publicaciones. An...