In the present chapter we have only to consider the logic of recepts, and, in order to do so efficiently, we may first of all briefly note that even within the region of percepts we meet with a process of spontaneous grouping of like with like, which, in turn, leads us downwards to the purely unconscious or mechanical grouping of stimuli in the lower nerve-centres. So that, as fully argued out in my previous work, on its objective face the method has everywhere been the same: whether in the case of reflex action, of sensation, perception, reception, conception, or reflection, on the side of the nervous system, the method of evolution has been uniform: “it has everywhere consisted in a progressive development of the power of discriminating between stimuli, joined with the complementary power of adaptive response.”[36] But although this is a most important truth to recognize (as it appears to have been implicitly recognized—or, rather, accidentally implied—by using a variant of the same term to designate the lowest and the highest members of the above-named series of faculties), for the purposes of psychological as distinguished from physiological inquiry, it is convenient to disregard the objective side of this continuous process, and therefore to take up our analysis at the place where it is attended by a subjective counterpart—that is, at Perception. So much has already been written on what is termed the “unconscious judgments” or “intuitive judgments” incidental to all our acts of perception, that I feel it is needless to occupy space by dwelling at any length upon this subject. The familiar illustration of looking straight into a polished bowl, and alternately perceiving it as a bowl and a sphere, is enough to show that here we _do_ have a logic of feelings: without any act of ideation, but simply in virtue of an automatic grouping of former percepts, the mind spontaneously infers—or unconsciously judges—that an object, which _must either_ be a bowl or a sphere, is now one and now the other.[37] From which we gather that all our visual perceptions are thus of the nature of automatic inferences, based upon previous correspondencies between them and perceptions of touch. From which, again, we gather that perceptions of every kind depend upon previous grouping, whether between those supplied by the same sense only, or also in combination with those supplied by other senses.