 The relation between the external world and our subjectivity is interactive and correlative.Combining the Buddhist idea of non-substance with a theory of evolution, Zhang held that the structures of the universe, although empty, are in evolution, and new kinds of structure may emerge due to changes in the combination of various structures.His most valuable contributions are also to be found in his endeavours to elaborate the dialectical aspect of Aristotelian logic, to connect logic, language and methods of disputation, and to discover principles and formal elements of the logic of linguistic pragmatism.