17.20 per cent. 18.84 per cent. began to menstruate at the age of 14 16.89 per cent. 18.02 per cent. began to menstruate at the age of 15 15.14 per cent. 16.59 per cent. began to menstruate at the age of 16 According to the same author, the average age at which menstruation begins is: In blondes 15.55 years. In brunettes 15.26 years. As regards race, it is well known that in Jewesses menstruation begins at an early age. According to _Joachim_ the age of puberty varies very greatly among the different races inhabiting Hungary. The first menstruation appears: In Slavonic girls between the ages of 16 and 17 In Magyar 15 and 16 In Jewish 14 and 15 In Styrian 13 and 14 FIRST APPEARANCE OF MENSTRUATION. The first appearance of menstruation is commonly preceded by various symptoms dependent on the increased flow of blood to the genital organs. Such symptoms are: Sacrache; dragging sensation in the loins; an indefinite feeling of pressure in the lower part of the belly, especially in the region of the uterus and the ovaries, which region is sometimes also tender on pressure; a slight feeling of weariness in the lower extremities; sudden flushings or pallors; alternating sensations of heat and chilliness, sometimes accompanied by actual though slight change of temperature. In many cases also there are disturbances in the intestinal evacuations and urinary secretion, in the process of cutaneous transpiration, and in the functional activity of the gastro-intestinal canal. A frequently observed symptom is an increased irritability of the entire nervous system, with an inclination to melancholy and indefinite amorous desires—symptoms which _Tilt_ denotes by the term “ovarianismus,” _Emmet_ by the term “erection,” _Lecal_ by the term “phlogose amoureuse,” and the older writers by the term “molimina menstrualia.” The nervous irritability manifests itself already before the appearance of the menstrual flow by headache and moodiness, weariness, nervous irritability, and low spirits; further, by slight changes in the facial aspect, dark rings round the eyes, spontaneous blushing, uneasy sensations, epigastric pain, loss of appetite, a sensation of pressure in the abdomen, palpitation, vertigo, dragging sensations passing from the loins to the thighs, feeling of weakness and numbness in the lower extremities—symptoms which often endure for several months and in such cases tend to lower the resisting powers of the organism.