MAMMALIAN TESTIS 



333 



60- * 30 

 



V'- 



Hormone assays in normal boys 

 (Data of Greulich el al ) 



. Androgen 



"" Gonadotropin 



Estrogz 



.^-^ 



10 is 



16 20 22 24 



2 4 6 8 10 12 14 16 



A§e in years 



Fig. 5.16. Frequencj- of puberty, measurements of testis and penis, and excretion of hor- 

 mones during puberty in man. (From A. Albert, L. O. Underdahl, L. F. Greene, and N 

 Lorenz, Proc. Staff Meet., Mavo Clin., 28, 409. 1953.) 



