=Hay Fever.=--Perhaps one-half of all adjusted cases recover fully, some at once and some after several months. By recovery is meant failure of the annual appearance of the attack with no symptoms at any time. No case can be pronounced cured in less than a year. The remaining half are modified little or not at all. =Headache.=--Nervous, bilious, ocular, and reflex headaches yield well. Toxic headaches, or those accompanying systemic infections, give way slowly with the cleansing of the system. =Hemorrhoids.=--Excellent, except when lower lumbars are anterior and defy adjustment. =Hernia.=--In all sites and forms of hernia, excepting strangulated hernia, prognosis is good. Strangulation requires immediate surgical interference. Prognosis is better if a truss be used. =Hodgkins’ Disease.=--Prognosis theoretically good, but the few cases under adjustment, while benefited, seem to have died of intercurrent disease, so that it is well to suspend judgment. =Hydrocele.=--Theoretically hydrocele should respond well, but in practice the author has seen several failures, and no cures. =Hydrocephalus.=--If due to cervical twisting at birth, the prognosis is fair; otherwise bad. =Hypertrophy.=--Adaptative hypertrophies, those due to overstrain upon an organ, do not and should not disappear until the strain has been relieved. Hypertrophy is sometimes accelerated by adjustment, as in the case of defective heart valves, when thickening of the wall restores and maintains compensation. Other hypertrophies tend to disappear under adjustment. =Hysteria.=--Good, but slow. Some extreme cases refuse to respond. Instant recovery from hysterical coma is the rule following adjustment, but the coma tends to recur. =Immunity.=--There is no doubt that adjustments often confer immunity from infection and contagion, but it is so difficult to strengthen every part of the body against every possible infection or contagion, and so uncertain that immunity really exists in a given case, that it is best always to assume the possibility of contagion and act accordingly. Adjustments following exposure to known contagion are always wise, but one may never know, if they succeed, that the patient might not have escaped without them. =Impotence.=--Variable outlook, according to secondary causes and pathology. Previous venereal disease renders the prognosis most doubtful. Nervous or vascular impotence is likely to respond well. If due to cord disease, the prognosis is to be made on the original disease. =Influenza.=--Mortality not more than 2 per cent, and that in the very aged and infirm. Duration varies greatly. May yield at once, first adjustment being followed by disappearance of fever, profuse perspiration, and completed convalescence in from twenty-four to forty-eight hours; or may require several adjustments at frequent intervals to break fever.