1910-11.] Bone Growth in absence of Functioning Testicles. 143 
165 mm. The percentage proportions of the different segments are given 
in Table XLV. For comparison, the proportionate lengths of the spinal 
segments of A 9 and the average of six Irish spines are included (see 
Table VIII.). 
These percentages show that the spine of A 10 approached to the type 
of A 9 ; and as the process of ossification in the thoracic segment was 
incomplete, the reasonable assumption is that had A 10 lived longer the 
approach would have been closer than it was. 
An unusual feature of the atlas and axis vertebrge was the misfit 
between them. In no position could the inferior articular surfaces of the 
atlas be coapted with any accuracy to the superior articular surfaces of the 
axis (see fig. 6). 
The ossification of the lateral plates of the sacrum was practically 
complete. 
In the thorax the ossification of the ribs was incomplete. The first rib, 
like the first rib of A 9, was rather narrower than normal at its anterior end. 
The more important measurements of the pelvis are given in Table XLVI. 
Table XLVI. — Dimensions of the Pelvis. 
mm. 
Breadth 263 
Height 210 
Breadth-height index ..... 79 
Transverse diameter . . . . . 135 
Conjugate diameter ..... 91 
Pelvic index ....... 67 ‘3 
Length of sacrum . . . . . 103 
Breadth of sacrum . . . . 121 
S acral index . . . . . . . 117 
Height of innominate hone . . . 210 
Breadth of innominate bone . . . . 145 
Height-breadth index ..... 69 
A comparison of the measurements in Table XIII. shows the pelvis as a 
whole to be small. The low pelvic index and the low height-breadth index 
of the innominate bones are evidence of the abnormality in pelvic form 
which is due to an increase in sacral and pubic breadth, and to unusual 
growth at the iliac crest and ischial tuberosity without corresponding 
growth at the triradiate cartilage. 
The sacral index shows the sacrum to be a broad bone, and the incom- 
pleteness of its ossification that it had not attained its maximum breadth. 
Neither had the innominate bone attained to its maximum size, for the 
region of the pubic symphysis was still cartilaginous. The reasonable 
assumption therefore is that the pelvis had not acquired its definitive 
breadth. 
