Metaphysics and the Limit of the Natural Sciences Explanatory Power

The article concern is the problem of natural sciences – metaphysics relations. The criterion of metaphysical knowledge as the knowledge about fundamental objects is formulated. It is argued that natural sciences and mathematics do not meet this criterion. They cannot be metaphysics being engaged in the study of exclusively non-fundamental entities. The inference is made that only the speculative metaphysics (if such metaphysics is possible) has the means to solve metaphysical problems relying entirely on its own foundation.