_Senses for another Class of Qualities._--The senses, as thus far analyzed, have reference primarily to the number magnitude, and distance of objects as occupying space--to quantities rather than qualities. Were it possible now to add to these a sense, or senses that should take cognizance of quality, as well as existence and quantity--that should detect, to some extent at least, the _chemical_ properties of bodies as connected especially with the functions of respiration and nutrition--the list of senses would seem to be complete. This addition is made, this knowledge given, in the senses of _smell_ and _taste_. _Possibility of additional Senses._--To those already named, other senses might doubtless have been added by the Creator, which would have revealed, it may be, properties of matter of which we have now no conception. It is not to be supposed that we know every thing respecting the nature and qualities of even the most familiar and common objects. Many things there may be, actual, real, in the world about us, of which we know nothing, because they come not within the range of any of our senses. But all that is essential to life, and happiness, and highest welfare is doubtless imparted by the present arrangement; and when closely studied, no one of these senses will be found superfluous, no one overlapping the province of another, but working each its specific end, and all in harmony. _The proper Office of Psychology in respect to the Senses._--It is the province of the anatomist and the physiologist to explain the mechanical structure of the several organs of sense, and their value as parts of the physical system. The psychologist has to do with them only as instruments of the mind, and it is for him to show their connection and proper office as such. This has been attempted in the preceding analysis.