Polizello, Andreza (Author)
Pereira Martins, Lilian Al-Chueyr (Author)
Filosofia e História da Biologia
Volume: 7, no. 2
Issue: 2
Pages: 137-155
During the 19th century several microscopic models involving particles arose in search for an explanation for heredity such as: Spencer's physiological units (1864); Darwin's hypothesis of pangenesis (1868); Galton's theory of stirps (1872); Nägeli's idioplasm (1884); De Vries' intracellular pangenesis (1889); and Weismann's germplasm, in 1892. This paper aims to analyze some of those proposals in order to provide an overview of the explanations for inheritance present in 19th century before and after Galton's theory of stirps. We will try to investigate if there were significant changes in the different scholar's thought related to the subject. This study led to the conclusion that in the proposals of the 1860's (Spencer, Darwin and Galton's ones) there were no concern in establishing a relationship with cytological studies. In this way, they dealt with hypothetical microscopic models. However, in the proposals of the 1880's (Nägeli, De Vries and Weismann's ones) this concern, as the time went by, was becoming more and more present. Galton's theory of stirps represents the transition between the two groups.
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