which was not developed by Le Sage in a more detailed way. In the "Physique Mécanique" published by Prevost after Le Sage's death, Fatio is mentioned in connection with the net structure of matter, but it goes on to claim that he (Le Sage) had developed the idea of the net structure already in 1763, before he was in possession of Fatio's original papers. However, according to Zehe's description of the Abauzit manuscript from 1758, this paper contains Fatio's description of the net structure of matter. In the same paper, Le Sage repeated the incorrect claim that Fatio assumed "elastic" collisions – and therefore did not really provide a valid explanation of gravity. Zehe attempted to account for Le Sage's puzzling claims that Fatio assumed "elastic" collisions by speculating that Le Sage must not have studied Fatio's papers very closely. In general, Le Sage and Prévost claimed that Le Sage's theory was superior to that of Fatio, but a more recent and detailed analysis of Fatio's paper by Zehe shows that it is Fatio's theory which is more developed. Gabriel Cramer, Franz Albert Redeker According to Le Sage, after creating his first essay on gravitation, he was informed in 1748 by Firmin Abauzit about a very similar theory of Gabriel Cramer, who happens to have been Le Sage's teacher in Geneva. In later years Le Sage responded in two different ways to charges that his ideas on gravitation were only the result of studying Cramer's papers. First, he argued that his first essay was written before he knew of the theories of his predecessors. Second, he argued that even if he knew about Cramer's theory, it makes no difference, because Cramer's theory is too vague and scientifically not valuable. Le Sage did, however, accuse Cramer of plagiarising Fatio's theory. (Fatio himself had made the same accusation.) In 1751 Le Sage also became aware of Franz Albert Redeker's theory. Le Sage began to write a history of theories of gravitation, in which he intended to describe the theories of Fatio and Redeker, but he never finished it. Summary Although Le Sage acknowledged that he was not the first one to propose such a theory, he always said that he was the first one who ever drew all consequences from the theory, even after coming into possession of Cramer's, Fatio's and Redeker's papers. For example, in his "Lucrece Newtonien" (1782) Le Sage