Antoni de Martí i Franquès and the debate about yellow fever in Barcelona in the early’s ninety Authors Agustí Camós Cabeceran Universitat Autònoma de Barcelona Keywords: XIXth century, Barcelona, Catalonia, Spain, yellow fever, Martí Franquès, Antoni Cibat, Llorenç Presas, Francesc Salvà, spontaneous generation, Inquisition Abstract Antoni de Martí, chemist and naturalist also made some medical research. Like many other contemporary medical doctors and surgeons from Catalonia such as Francesc Salvà and Antoni Cibat, he also investigated the «yellow fever» impressed by the outbreak occurred in 1803 in Barcelona. Taking into account his work about the composition of the air and the writings from Llorenç Presas inspired by Marti’s ideas, we know that he did not trust that diseases were caused by changes in the proportion of atmospheric gases, which related the origin of infectious agents with the spontaneous generation. Instead of this, he thought that these agents might be propagated bythe air.Key words: XIXth century, Barcelona, Catalonia, Spain, yellow fever, Martí Franquès, Antoni Cibat, Llorenç Presas, Francesc Salvà, spontaneous generation, Inquisition Downloads PDF (Català) Issue Vol. 9 (2016) Section Articles License The intellectual property of articles belongs to the respective authors.On submitting articles for publication to the journal Actes d’Història de la Ciència i de la Tècnica, authors accept the following terms:Authors assign to Societat Catalana d’Història de la Ciència i de la Tècnica (a subsidiary of Institut d’Estudis Catalans) the rights of reproduction, communication to the public and distribution of the articles submitted for publication to Actes d’Història de la Ciència i de la Tècnica.Authors answer to Societat Catalana d’Història de la Ciència i de la Tècnica (SCHCT) for the authorship and originality of submitted articles.Authors are responsible for obtaining permission for the reproduction of all graphic material included in articles.SCHCT declines all liability for the possible infringement of intellectual property rights by authors.The contents published in the journal, unless otherwise stated in the text or in the graphic material, are subject to a Creative Commons Attribution-NonCommercial-NoDerivs (by-nc-nd) 3.0 Spain licence, the complete text of which may be found at http://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.en. Consequently, the general public is authorised to reproduce, distribute and communicate the work, provided that its authorship and the body publishing it are acknowledged, and that no commercial use and no derivative works are made of it.Actes d’Història de la Ciència i de la Tècnica is not responsible for the ideas and opinions expressed by the authors of the published articles.