_Anger the conservative instinct in its offensive form—Physiology—Psychology—Anger passes through two stages, one simple, the other mixed—Its evolution—Animal form, or that of actual aggression—Emotional form, or that of simulated aggression—Appearance of a pleasurable element—Intellectualised form, or that of deferred aggression—Pathology: Epileptic insanity, corresponding to the animal form; the maniacal state, corresponding to the affective form—Disintegrated forms of anger—Overpowering tendencies to destructiveness—How do they arise and take a definite direction?—Return to the reflex state—Essential cause: temperament—Accidental causes._ I. The instinct of individual conservation, under its offensive form, is the origin of anger—the type of violent and destructive tendencies. This emotion is the second in chronological order, appearing at two months, according to Perez, and, definitely, at ten months, according to Darwin and Preyer. Bain defines it as “a conscious impulse which drives one to inflict suffering and to draw a positive enjoyment from the fact.” This definition does not seem to me strictly applicable to the inferior or animal forms of anger, as we shall see presently. Considered objectively, or from without, anger presents itself with very clearly defined characters as regards its physiology and its mode of expression.[141] ----- Footnote 141: For detailed descriptions see Darwin, chap. x.; Lange, _op. cit._; Mantegazza, _op. cit._, chap. xiii. The latter transcribes the picture drawn by Seneca in his _De Ira_, and is of opinion—in which I agree with him—that it is traced by a master hand. ----- 1. Dilatation of the blood-vessels, augmentation of the cutaneous circulation, redness and swelling. This is also found in joy, but, remarks Lange, with less intensity. Besides, anger has a special manifestation of its own—_i.e._, the distention of the greater veins, especially on the face and forehead. In its extreme form (rage) it may cause nasal or pulmonary hæmorrhage, the rupture of vessels, and death. 2. The innervation of the voluntary muscles is increased, but in an un-coordinated and spasmodic form; the voice is broken and harsh, the body leans forward in the attitude of aggression, the movements are violent and destructive; “one strikes blindly,” the breath comes in gasps with the well-known symptom of the dilated nostrils, the object of which, according to Piderit, is that of taking a full breath while the mouth is shut and the teeth clenched. According to Charles Bell, it is due to the habitual co-action of all the respiratory muscles, as the nostrils of an angry man may be seen to become dilated, although his mouth is open.