O artigo examina como o acaso e o erro estão à raiz da descoberta de Chagas sobre a nova entidade mórbida que tomou seu nome. Do ponto de vista da epistemologia histórica, se faz uma reavaliação dos caminhos tomados pela pesquisa de Chagas, lançando dúvidas sobre a versão que se tornou oficial e concluindo que a lógica da história contradiz o direito da lógica.
François Delaporte : Problem organisms.
This article discusses the problem of the distinction between animality and vegetality which preoccupied many 18th-century scientists, in particular Peyssonnel, Tremblay, Reaumur and Bonnet. They were attempting to construct a coherent image of the ladder of beings by analysing their characteristics, but the problem was compounded by the nature of the criteria they had chosen. As a result they were forced to reduce the role attributed to zoophytes, which enabled them to gain a clearer picture of nature.
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