  While these interpretive proposals collectively advance our understanding of how the Antinomy might be defused, each has its share of philosophical difficulties, as spelled out in Watkins (2009). Moreover, few of these construals heed close to Kant’s words, which suggest strongly that his solution relies indispensably on a “supersensible ground” (5: 413), or explanatory principle located in the noumenal world. That ground could unite both mechanism and teleology, by making both antinomic theses jointly derivable or explainable from it. However, since humans can have “no positive determinate” knowledge of any supersensible entity, the Antinomy is solvable in principle rather than solved in fact. Kant (at least in his official solution) does not seem to provide the details for an actual account of how the conflict at the heart of biological explanation is removed. The limitations that beset our understanding of Kant’s philosophy of biology so far, some of which we have expounded above, continue to drive interpretive efforts to cast more light on that part of his doctrine, as exemplified in Goy and Watkins (forthcoming).