 It is easy to understand why some authors have taken such statements as evidence that Mill was defending an anti-psychologistic position of sorts. And yet, we must remember that these statements directly contradict other of his pronouncements, some of which were quoted earlier. Recall only that Mills defines logic as ‘the science of the operations of the human understanding in the pursuit of truth’ (1843, 6). There is no denying that Mill’s theory of logic contains incompatible views.