Cases have been reported in which husband and wife have contracted dandruff after marriage, he or she having been free before. The drugs that are most efficacious in the cure of seborrhea are active antiparasitics. _Causes of Seborrheic Eczema._—The general causes are debility, constipation, and anything which undermines the general health. The local causes are lack of cleanliness of the scalp, and using combs or hair-brushes which have been used on the scalps of persons who were suffering from this disease. In most families will be found one or more members who possess enough seborrheic infection to cause the spread of the disease throughout the rest of the household. =Causes and Treatment of Premature Thinness of the Hair and Baldness.=—It has already been stated that 70 per cent. of these cases were caused by seborrheic eczema. Among other causes may be mentioned a progressive tightening of the scalp upon the skull, the scalp having lost the cushion of fat that is under it in early life; insufficient or improper care of the scalp; daily sousing of the head in cold water, combined with improper drying of the hair afterward; sweating of the head; constant mental strain, either on account of intellectual work or worry; wearing stiff, unyielding hats; gout, and all diseases which lower the general nutrition. The chief treatment is by prophylaxis, or using preventive measures to insure the healthy condition of the scalp. And first and most important of these is cleanliness. Because of the great length of time which it takes to dry long, thick hair, many women do not wash the scalp often enough. In the healthy state of the scalp it should be washed at least once a month. =The Care of the Hair.=—There is never any danger of shampooing the healthy scalp too frequently. The oil in the scalp is not removed by washing, but is, on the contrary, always increased through the improvement in the circulation. Where there is much dandruff, or if the hair has begun to fall out prematurely, owing to long neglect or following an illness, it is well to begin by washing the hair two or three times a week, and then gradually increase the interval to every two or three weeks. Borax in the water cleanses the scalp well, but its continuous use is injurious; the same may be said of ammonia water.