9 years in 1 instance. 10 years in 4 instances. 11 years in 31 instances. 12 years in 244 instances. 13 years in 864 instances. 14 years in 1641 instances. 15 years in 1795 instances. 16 years in 2012 instances. 17 years in 1692 instances. 18 years in 910 instances. 19 years in 498 instances. 20 years in 183 instances. 21 years in 65 instances. 22 years in 19 instances. 23 years in 5 instances. 24 years in 3 instances. 32 years in 1 instance. In women of German race living in Russia puberty was earliest, occurring at the average age of 15.16 years; in Finnish women it was latest, occurring at the average age of 16.17 years. 2. _Middle Europe._ In Germany, according to the tables of _Krieger_ and _L. Mayer_, who have recorded 11,500 cases in all, menstruation begins most commonly (in 18.931 per cent. of the cases) at the age of 15; the next most frequent age is 14 (18.213 per cent. of the cases). For Berlin, in a number of cases collected from the lower classes of society, we find the average age for the first appearance of menstruation to be 16.18 years. Notwithstanding the more northerly situation of Berlin, the average age at puberty is somewhat less than in Munich, situated 4½ degrees to the southward, for the reason that the retardation dependent upon altitude makes itself manifest in the latter town, which is situate about 500 metres (1,640 feet) higher above the sea level. Whereas in Berlin 18 per cent. of all cases begin to menstruate at the age of 14, and 19 per cent. at the age of 15, in Munich the two leading years are 15 with a percentage of 17½, and 16 with a percentage of 18¾. In Great Britain, according to _Krieger_, the average age at which menstruation begins is 15 years, 1 month, and 5 days. For Manchester the age given is 15 years, 6 months, and 23 days. In France, according to the calculation of _Brierre de Boismont_, the most frequent age for the first onset of menstruation is 16. In Paris the average age is 14 years, 6 months, and 14 days. Bohemia, Upper and Lower Austria, and Moravia have an average age of 16 years and 2 to 3 months. 3. _Southern Europe._