Even though it cannot yet be regarded as fully determined whether the increase observed by _Viault_, _Egger_, and _Mercier_, in the corpuscular richness and hæmoglobin-richness of the blood in consequence of residence in a mountain climate, is lasting or merely transitory, yet it is certain that the hæmatopoietic organs are favorably influenced by such residence, and that the good results are augmented by the stimulating effect mountain air exercises on the appetite and the digestion. _Lombard_ has moreover observed, that at a high altitude the menstrual flow is more abundant and dysmenorrhœa is less common. For young girls, therefore, suffering from irritable conditions of the heart, increased frequency of the pulse, or increased arterial tension, and for those also in whom the resisting power of the organism appears deficient, a visit to a mountain health resort situated amid forests may be recommended. For scrofulous girls a visit to the coast of the North Sea is especially suitable. For the slighter forms of anæmia, a sea voyage, in which the benefits of sea air can be obtained more fully, and for a longer period, may be advised; but such a voyage is quite unsuitable for those suffering from severe anæmia or chlorosis. Such very weakly, intensely anæmic and chlorotic patients should spend the winter in some southern health resort. The skin, in which disturbances so readily occur at the time of the menarche, requires careful attention, all the more because it is precisely at this age that young girls have the greatest need of their personal charms. The skin of the face, which is often disfigured by comedones and acne, must be carefully guarded against the accumulation of sebum in the sebaceous glands by sedulous washing with warm water and a good soap. If the seborrhœic[30] process in these glands becomes at all severe, ordinary soaps are unsuitable, and a potash soap must be used, such as sapo viridis, or spiritus saponatus kalinus, which have great power of dissolving fats.