 There are two main interpretations of real essences in the literature: the relativized real essence thesis, according to which a real essence just is whatever microstructure causes the nominally essential qualities of the object; and (for lack of a better name) the unrelativized real essence thesis, whereby the real essences consist of the total microstructure of the substance, not just the features causally responsible for the nominal essence. Textual evidence for the relativized real essence thesis comes from III.vi.6: