PIGMENTATION IN OLD AMERICANS HRDLICKA. 



481 



A special inquiry into this subject among 250 male and 

 Old Americans, taken without any selection, showed the 

 results given below. As all the females were examined 

 hair undone and freely hanging down to permit the 

 taking of head measurements there can be no question 

 server having been misled. 



Old Americans: Loss of hair. 



200 female 

 interesting 

 with their 

 unimpeded 

 of the ob- 



Loss. 



No plainly appreciable. 

 Slight 



Some to one-third 



Approximately one-half 

 Two-thirds to near all. . 



Males (250). 



Cases. 



Per cent. 

 45.2 

 13.6 

 22.4 

 7.2 

 11.6 



Ages. 



Average. 



37 

 39 

 46 

 49 



Ex- 

 tremes. 



24-60 

 24-60 

 24-57 

 29-65 

 35-64 



Females (200). 



Cases. 



Per cent. 



85 



11 



3 



1 



Ages. 



Average. 



Ex- 

 tremes. 



44 



23-60 



Old Americans: Loss of hair in relation to age. 



MALES (250). 



Age and number of subjects. 



21-30 (100). 

 31-40 (63).. 

 41-50 (44).. 

 51-60 (35).. 

 61-65 (8)... 



None 

 percep- 

 tible. 



Per cent. 

 68 

 46 

 29.6 

 8.6 



Slight. 



Some to 

 one-third. 



Per cent. 

 11 



17.5 



18.2 



8.6 



12.5 



Approxi- 

 mately 

 one-half 

 (two- 

 fifths to 



four- 

 sevenths.) 



Per cent. 

 17 



22.2 

 34.1 

 25.7 

 12.5 



Per cent. 

 3 



4.8 

 6.8 

 20 

 25 



FEMALES (200). 



Two- 

 thirds to 

 near all. 



Per cent. 



1 



9.5 

 11.3 

 37.1 

 50 



21-30 (80). 



31-40 (63). 



41-50 (29). 



51-60 (28). 



98.8 

 95.5 

 85 

 84.3 



1.5 



5 



5 



L2 



1.5 

 10 

 7.1 



1.5 



3.6 



The above figures show that loss of hair in the Old Americans 

 presents wide individual and even wider sexual variation. There 

 were seen men and women of sixty in whom there was as yet no ap- 

 preciable loss; but on the other hand plain thinning was seen not 

 merely in some of the youngest male adults of the series but even in 

 some subadults down to 18 years of age. The progress of the con- 



