Among the topics: The hygienic conditions of ancient, medieval, viceregal, Bourbon Naples: the house, the streets, the waters, the way of life - Naples in the first decades of the 19th century: The question of habitability, traffic and cleanliness published at the beginning of the last century - Naples at the end of the 19th century: the Redevelopment - The grandiose work of the Serino Aqueduct - The sewerage of the city of Naples - The Hygiene and Public Health Office - The hygienic future of Naples: Measures in progress, Projects and proposals, Forecasts and hopes - The climate of Naples - Notes on Neapolitan demography and medical statistics.