CHAPTER III.
PLEASURE 48
Subject little studied—Is Pleasure a sensation or a quality?—Its physical concomitants: circulation, respiration, movements—Pleasure, like pain, is separable: physical and moral anhedonia—Identity of the different forms of pleasure—The alleged transformation of pleasure into pain—Common ground of the two states—Hypothesis of a difference in kind and in degree—Simultaneity of two opposite processes: what falls under consciousness is the result of a difference—Physiological facts in support of the above.
CHAPTER IV.
MORBID PLEASURES AND PAINS 61
Utility of the pathological method—Search for a criterion of the morbid state; abnormal reaction through excess or defect; apparent disproportion between cause and effect; chronicity—I. Morbid pleasures, not peculiar to advanced civilisation—Different attempts at explanation—This state cannot be explained by normal psychology: it is the rudimentary form of the suicidal tendency—Classification—Semi-pathological pleasures: those destructive of the individual, those destructive of the social order—II. Abnormal pains—Melancholic type—Whence does the painful state arise in its permanent form? from an organic disposition? or from a fixed idea?—Examples of the two cases.
CHAPTER V.
THE NEUTRAL STATES 73
Two methods of study—Affirmative thesis founded on observation, deduction, and psycho-physics—Negative thesis: the psychological trinity; confusion between consciousness and introspection—Diversity of temperaments.