The importance of drawing a broad line between the active and the passive branches of our primary sensibilities is seen in various applications, but most especially in the problem of 5 External Perception. The great distinction that this problem requires us to draw between the external and the internal sides of our being (so described by an imperfect metaphor) has its deepest foundation in the distinction between the sense of expended muscular energy and the feelings that are neither energy in themselves, nor vary definitely according to our energies. The qualities of things admitted on all hands to be qualities of the external (or object) world—called the Primary Qualities, Resistance and Extension,—are modes of our muscular energies; the qualities that do not of themselves suggest externality, or objectivity,—the secondary qualities, as Heat, Colour, &c.—are our passive sensibilities, and do not contain muscular energy. When these secondary qualities enter into definite connections with our movements, they are then referred to the external, or object world. Light and colour, when varying definitely with our various movements, as postures and actions, are from that circumstance referred to the external, or non-ego; without such connections they would be called internal or subjective states.
The contrasted terms ‘Object’ and ‘Subject’ are the least exceptionable for expressing the fundamental antithesis of consciousness and of existence. Matter and Mind, External and Internal, are the popular synonyms, but are less free from misleading suggestions. Extension is the Object fact by pre-eminence; Pleasure and Pain are the most marked phases of pure Subjectivity. Between the consciousness of extension and the consciousness of a pleasure there is the broadest line that can be drawn within the human experience; the broadest distinction in the whole universe of being. These then are the Object and Subject extremes; and, in the final analysis, the object extreme appears to be grounded on the feeling of expended muscular energy.
The second omission alluded to is the Digestive Sensibility, which ought undoubtedly to be included among sensations, having all the constituents of a sense; an object—the food; a sensitive organ—the stomach; and a characteristic form of sensibility or feeling. The author farther takes notice of 6 ‘Sensations of Disorganization, or of the approach to Disorganization, in any part of the body,’ which too deserve to be reckoned among mental facts. He might farther have adverted to the acute and depressing feelings of the Lungs, in case of partial suffocation, with the exhilaration attending the relief from such a state, and the change from a close to a fresh atmosphere. Moreover, there are states of purely physical comfort, associated with a vigorous circulation, with healthy innervation, with the proper action of the skin; and feelings of discomfort and depression from the opposite states. A slight [allusion] to these various feelings occurs in chapter second towards the close.
These various modes of sensibility seem to be fitly grouped together under the common head of Sensations of Organic Life: their detail being arranged according to the several organs–viz.—the Alimentary Canal, Lungs, Circulation, Nervous System, &c. These would make a sixth Sense properly so called, or a department of passive sensibility.—B.
SECTION I.
SMELL.
It is not material to the present purpose in what order we survey the subdivisions of this elementary class of the mental phenomena. It will be convenient to take those first, which can be most easily thought of by themselves; that is, of which a conception, free from the mixture of any extraneous ingredient, can be most certainly formed. For this reason we begin with SMELL.[2]
[2] The order of exposition of the senses is not a matter of indifference. The author, like Condillac, selected Smell to begin with, as being a remarkably simple and characteristic feeling; he has found another expository advantage in it, by disturbing our routine mode of regarding the intellect as principally made up of sensations of sight. It has a startling effect on the reader, to suggest a mental life consisting wholly of smells and ideas of smell.
There are two principles of arrangement of the senses, each good for its own purpose; it being understood that the active or muscular sensibility is taken apart from, and prior to, sensation proper.