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This paper aims to analyze key postulates of Leibniz's vitalist ontology, with a special emphasis on his conception of a natural machine and his monadological proposal. It is divided into three sections: first I analyze the complex structure of natural machines, from which a twofold composition of action can be reckoned; hence, the second section identifies three kinds of monads, with the purpose of devising the possibility of rational agency; finally, the third section draws some relevant conclusions for Leibniz's account of action, as the place of perception in the process of choice and Leibnizian intellectualism, among others. [ABSTRACT FROM AUTHOR]

In this paper I argue that the scientific approaches of Jakob von Uexküll crucially support Martin Heidegger's metaphysical reflections about the world, beyond what Heidegger himself explicitly recognized. In particular, Jakob von Uexküll's studies emphasized, better than mechanicism and vitalism, the relationship between the environment and the inner world of the animal, which is crucial for Heidegger to claim in his winter 1929-1930 lessons that the essence of the animal is "disturbance" (Benommenheit). [ABSTRACT FROM AUTHOR]