H51 



women in general. It is well known that this iige shows great indi- 

 vidual variations, and this is also seen in the Table I, in which 

 the actual numbers, as well as the relative percentage, have been 

 stated according to the age. 



In tig. I curve .4 shows, in percentages, its appearance at each 

 separate age. 



26% 

 24% 

 22% 

 20 % 



15 i 



16 % 



m \ 

 u % 



lü % 



ax 

 6 X 



17 



IS 20 



^\ 



Fig. 1. 



From this table and grapli it appears tiiat the beginning of the 

 function of the sexual glands varies between the tenth and eighteenth 

 year; it is true that in 4 cases the menses already appeared before 

 the JO"' year (8 years 2 mths; 8y 12m; 9y 4m; and 9y 12m), 

 but these cases do not join regularly on to the variability-curve and 

 may be regai-ded as abnormal precocity. 



The varability -curve of the nienarche begins as an unbroken line 

 at the age of 10 years and 4 months, mounting continually after 

 this. This mounting during the 10"' and 11"' year is to be seen in 

 Table II, in which the number of cases per month during these 

 years has been noted. I have inserted this table, as it shows that 

 the earliest age at which the menaiche, as a physiological pheno- 



