“PRESIDENTS ADDRESS. _ 67 
The interspinous breadth appearsto slacken in its growth 
about age 153, but the number of boys measured was not 
sufficiently large to enable the point to be satisfactorily 
determined. 
Pelvic Measurements, Boys. 
Age Intertrochan-| Intercristal | Interspinous| Conjugate 
“| teric Breadth.| Breadth. Breadth. | Diameter. 
Years. | Inches. Inches. Inches. | Inches. 
53 7°46 6°94 6°38 | 4°57 
6 7°54 7°01 | 6°42 | 4°65 
4 7°72 Yow |g |- 6°46 4°74 
7 7°87 7°32 6°61 | 4°82 
4 7°95 7°36 6°65 4°90 
8 8°05 7°40 6°67 4°98 
84 8°19 7°60 6°75 5°06 
9 8:4) 739 6:93 5°24 
3 8°68 Sel tel 5°46 
10. =| 8°84 8°19 bend, 5°62 
103 | 8°91 8°25 | 7°24 5°46 
1} <.| 9°07 8°38 7°32 5°71 
113 sO 9°23" ~ 8°50 7°37 5°79 
pea 9°37 8°62 748 5°88 
124. | 9°53 8°78 7°64 5°97 
13 9°72 8°94 7°72 6°06 
133 | 9-92 9°09 7°87 6°18 
14) 10°14 9°25 8°06 6°30 
144 | 10°43 9°43 8-21 6°48 
15 10°7 S367 8°39 6°60 
153 11-02 9°84 8°54 6°75 
16 11°24 10°02 8°60 6°87 
163 | 11°46 10:28 | =8*62 6°95 
The pelvic measurements of girls are naturally more 
interesting and present greater peculiarities than those of 
boys. The intertrochanteric, intercristal, and interspinous 
breadth, present much the same features of development. 
In each case the growth is quicker, and the measurement 
larger at each age, than in boys. The intertrochanteric 
breadth shows a rapid and regular increase up to 124 
yeays—from this stage there is a sudden development, the 
measurement increasing three-quarters of an inch in six 
months. From the 13th year the rate of increase originally 
experienced is maintained, and at 164 years the development 
of the pelvis still continues. The external conjugate diame- 
ter is less in girls than in boys, the greatest difference being 
