=Quality of Feeling States.=--The qualities of our various feeling states are distinguished under two heads, pleasure and pain. It might seem at first sight that our feeling states will fall into a much larger number of classes distinguished by differences in quality, or tone. The taste of an orange, the smell of lavender, the touch of a hot stove, the appreciation of a fine piece of music, and the appreciation of a lofty poem, seem at first sight to yield different feelings. The supposed difference in the quality of the feelings is due, however, to a difference in the knowledge elements accompanying the feelings, or to the fact that they are discriminated as different experiences. The idea of the music or the poem is of a higher grade than the sensory image of taste, and accordingly the feelings _appear_ to be different. The feelings may, of course, differ in intensity, but in _quality_ they are either pleasant or unpleasant. CONDITIONS OF FEELING TONE =A. Neural.=--The quality, or tone, of a feeling will vary according to the intensity of the impression. Great heat stimulates the nerves violently and the resultant feeling state is painful; warmth gives a moderate stimulation and the resultant tone is pleasant. Excessive cold also, because it stimulates violently, produces a painful feeling. Since the intensity of a stimulus varies according to the resistance encountered in the nervous arc, the quality of a feeling state must, therefore, vary according to the resistance. It is for this reason that an experience, at first very painful, may lose much of its tone by repetition. By repetition the nerve centres are adapted to the experience, resistance is lessened, and the accompanying pain diminished. In this way, some work or exercise, which is at first positively unpleasant, may at least become endurable as the organism becomes adapted to the occupation. From this point of view, it is sometimes said that any impressions to which we are perfectly adapted give pleasurable feelings, while, in other cases the resultant tone will be painful.