To celebrate Prof.rs Vittorio Del Vecchio and Salvatore Ugo D'Arca, respectively the sixth and the seventh director of the Institute of Hygiene of the University of Rome, the Authors present and discuss the conferences on The climate of Rome given by Prof. Corrado Tommasi-Crudeli, founder and first director of such an Institute back in 1885. Particularly, the Authors illustrate the six tables shown by the speaker, which represent the scientific basis for the reclamation of Roman "Agro", affected by malaria at that time.