Natural Propositions is about the desirable consequence of Charles Peirce's conception of propositions; namely, that they are no strangers to a naturalist world-view and thus form natural inhabitants of reality. This is because propositions---in Peirce's generalization: Dicisigns---do not depend upon human language nor upon human consciousness or intentionality, contrary to most standard assumptions. In addition to a careful consideration of Peirce's work, the book includes numerous examples of Dicisigns in nature as firefly signaling and vervet monkey alarm calls.