Abstract
The concept of sciences holds a central place in the early philosophy of Ernst Cassirer and it provides a conceptual framework even for the philosophy of symbolic forms. This paper identifies Cassirer's concept of sciences as a double barrelled reconstructive approach, which allows to understand not only the constitution of actual scientific semantics but at the same time the transformation of the scientific mode of thought. It is shown, that these principles of transformation are indeed the very form of form, referring to which the transformation of a mode of thought is to be considered as a process of self-determination and self-development, a process that can only be understood re-constructively. It is this reconstructive approach of Marburgian Neokantianism which provides a specific culturalist point of view on the status of sciences and their formal, theoretical and experimental modes of world-making.