_Symptoms of libido._—The normal libido and orgasm show certain defined symptoms by which the presence of the larger lust may be easily diagnosed. While in libido corpora conjugum are in a state of excitement, caused by the irritation of the fibres of the sympathetic nerves. The irritation spreads over the entire extent of the vasomotor system and causes a paralysis of the vasomotor nerves. The result is the widening of the coronary arteries, hyperaemia of the heart muscles, and hence an increased excitation of the heart ganglia and palpitation of the heart. The circulation is accelerated, the arteries beat strongly, and the venous blood, arrested in the vessels, augments the animal heat. The stagnation of the blood, more pronounced in the brain by contraction of the muscles of the neck and the retraction of the head, causes a momentary cerebral congestion. During its continuance the intellectual faculties are held in abeyance. The eyes are markedly injected, the bulbi of the eyes protuberate, and the pupils are enlarged almost twice their normal size. The eyes become haggard, and the sight is dimmed, or the eyes are spasmodically closed in order to shut out light. The respiration is rapid and panting, coming in short and quick intervals, the air being expelled spasmodically. Some times the respiration is entirely suspended by a convulsive contraction of the larynx, and the breath is ejected in the shape of babbling, incoherent words. The congested nerve-centres communicate only vague and confused outside sensations. Mobility and sensibility are held in suspension. The limbs are convulsively agitated or are subject to clonic contractions. The nostrils are dilated, the jaws are firmly set, and the teeth are ground one against the other. These different expressions of the summa libido are accompanied by caressing words. Ovid, the master in matters of sensuality, sings in his “Ars Amandi”: “Nec blandae voces jucundaque murmura cessent “Nec taceant mediis improba verba jocis “Adspicies oculos tremulos fulgore micantes “Ut sol a liquida saepe refulget aqua “Accedent questus, accedet amabile murmur “Et dulces gemitus aptaque verba joco.” Where these symptoms are wanting, the absence of the potency of experiencing libido may be assumed.