Introduction: Kant on Science and Biology -- Kant's Conception of Proper Science -- Mechanical Explanation and Grounding -- Kant on Teleology -- Kant on the Domain and Method of Biology -- Kant on the Systematicity of Physics and the Opus postumum -- Vital Forces and Organisms in the Opus postumum -- Materialism, Hylozoism, and Natural History in the Opus postumum -- Concluding Remarks