PRESIDENT’S ADDRESS. 565 
Lengths of Superior and Lower Extremities. 
Superior Extremity. Lower Extremity. 
Age. 
Upper Arm. Forearm. Hand. Thigh. Leg. Foot. 
Years. | Inches. Inches. | Inches. | Inches. | Inches. | Inches. 
Dy ae 8°43 6°06 | 5°04 11°93 9°45 6°73 
6 8°66 6°18 His 112) 12°20 9-69 6°89 
63 8°70 6°38 5°20 12°44 9°72 7°05 
7 8°82 6 42 5-8 12°64 9°84 Ges 
73 9-02 6°57 5°39 12°76 10°00 7°20 
8 9°25 6°57 5°43 12°99 10°28 7°40 
3 9°57 6°69 5°47 13°39 10°55 7°60 
9 9-69 6°69 Oyen | 13°78 LOss5 746 
91 OF SO Ome 5-99 14°13 11°14 7-9 
10 10°04 | 7°05 5°59 14°45 | 11°38 8-08 
104 10°16 7°20 5°67 14°65 11°65 8°19 
11 10 31 7°40 5°83 15°04 SECON | 8°35 
vale 10°55 7°60 5°98 15°47 12°32 8°54 
12 10°87 7°72 6°06 Pas oras 12°60 8°58 
123 11°10 TOV 6°18 16°18 12°99 | 8°74 
13 11°18 8:07 6°26 16°54 13°23 8:90 
133 Li 34 8°27 6°38 16°89 13°35 9:02 
14 IGT 8:43 6°57 17°24 13°62 9°21 
143 11°89 8°66 (Syateh nl | Sag rar 14°09 9-45 
15 ibaa Wy) 8°82 Leyes yl Winey |e oi (af 1 tS ¥/ 9°53 
153 12°20 8:90 6°85 18°23 14°37 9°57 
16 1232 9:02 6:97 | 18°46 14°53 | 9°65 
163 12:60 9°25 7°09 19°13 15:00 | = 9°69 
The superior extremity grows proportionately in its 
three parts (upper arm, forearm, and hand) until adult 
age is attained—the upper arm being 43-7, the forearm 
31-5, and the hand 24°8 per cent. of the total length. The 
rate of growth is also fairly regular, though there is a 
slight retardation at about age 15. 
The leg and thigh of the girls do not grow proportion- 
ately as in boys. The thigh in boys averages 55°8 per 
cent. of the whole of the lower extremity; in girls it is 
only 52-3 per cent. at age 54 years, gradually increasing, 
until at age 12 it has reached 54-9 per cent., which is the 
maximum proportion; in subsequent years it decreases, 
and at 16 years the proportion has again fallen to 52-2 
per cent. From 54 years until 12 the thigh grows more 
quickly than the leg; from age 12 to age 14 the two parts 
of the lower extremity grow proportionately; but after 14 
