From the 1980s onwards, diverse studies carried out by historians and philosophers of science have studied the reasoning used by Charles Darwin in the elaboration of the Theory of Evolution. However, the role of abduction in Darwin's discoveries has not been yet examined. This type of inference was delineated by Charles Sanders Peirce in the late 19th century. The aims of this grant research are: (1) to identify the occurrence of abductions in the creation of Darwin’s Theory; (2) to examine whether the structure of Darwin's conceptual framework fits to the idea of a broad-scale pattern of discovery; and (3) to propose a Bayesian model of discovery to represent broad-scale discoveries in science using Darwin's discoveries as historical example.