Sommer (_Zeitschrift für Psychologie_, vol. ii.) reports an observation on an aphasic patient, which admits of an analogous interpretation. ----- I merely indicate in passing this general hypothesis. Whether admitted or not, the relation between the feelings and the association of ideas, though often misunderstood, has been indubitably proved by a mass of facts which, in spite of their heterogeneous character, all point to the same conclusion. PART II. SPECIAL PSYCHOLOGY. INTRODUCTION. _Importance of the study of special feelings—Utility of historical documents—Causes of the evolution of the feelings: (1) intellectual development; (2) hereditary influence, perhaps reducible to influences of environment—Cases in which the evolution of ideas precedes that of feelings—Inverse cases—The intellect swayed by the principle of contradiction; feeling by that of finality—Classification of primitive tendencies—Method to be followed—Group I.: physiological (reception, transformation, restitution)—Group II.: psycho-physiological—Group III.: psychological—Their enumeration._ I. The special study of the various manifestations of the emotional life enables us to penetrate much further into psychology than do the preceding generalities. This study is not a merely supplementary or elucidatory one to be abbreviated, treated cursorily, or even omitted altogether, as is done by some representatives of the intellectualist theory. As long as we have not considered, _seriatim_ and in detail, every feeling, whether simple or compound, we have no idea of their rich multiplicity of aspects, of which general formulas are only meagre abridgments.