Nerve - power is impaired in this affection, the emotions not being under normal control; more or less neuralgia is often concomitant, and altogether it is a condition in which we should expect phosphorus to be useful, and instances of its value are on record. The cases benefited by it have been acute or chronic, dependent on sudden shock, or gradually coming on with increasing weakness and despondency; in either form a period of debility is liable to be followed by convulsive attacks. I do not undervalue moral and hygienic treatment; but, among medicines, phosphorus in doses of 1/100 to 1/20 gr. has proved efficient in my hands. When hysterical attacks are connected with delayed or suppressed menses, pain in iliac and lumbar regions, vomiting, palpitation, and general excitement alternating with depression, I have found this remedy regulate the menstrual periods and cure the hysterical symptoms.