Hegel's Phenomenology of Spirit (1807) was supposed to be the introduction and first part of the Jena System III, and as such it was to introduce us to the other parts of the project. Most commentators on Hegel's Phenomenology, however, do not consider how the Phenomenology relates the other parts, and some discount Hegel understanding and commitment to the natural philosophy of his day. This paper attempts to make the connection between the Phenomenology and the Natural Philosophy of 1805-06 explicit; to show where and how the connections are made; to identify how Hegel uses the natural sciences of his day in creating his system. By showing this I hope to prove that his concept of Spirit is born within his natural philosophy. It is part ...