188 REPORT ON AN ADDITIONAL COLLECTION OF SKELETAL 
RELATION OF SKULL CAPACITY TO STATURE 
| Bicondylar length Femoro-cranial index 
Skull No. | Cranial Capacity ӨГ (= с. с. of skull capacity рег 
| right femur 1.0 cm. of femoral length) 
| | 
Ма1ев | с.с, | ст. | 
255.218 | 1350 | 45.0 (left) | 30.1 
.111 | 1390 | 44.7 | 81.1 
.210 | 1420 | 43.1 52.9 
.106 | 1420 | 43.0 (left) 33.0 
lf 1440 | 44.7 32.2 
211 | 1470 | 44.6 33.0 
.201 157 | 45.5 34.5 
| S THO REC 
| 
Females | | 
255,213 1215 | 42.0 | 28.9 
.216 | 1325 | 40.6 | 32.6 
212 330 43.1 | 30.9 
.214 1390 | 41,4 | 38.6 
жа 1390 | 41,2 88.7 
maximum апа of the nasion-opisthion are аге given next to show their relative 
value in comparison with the capacity. Reference to the tabulated data shows 
that the measurements most closely expressing or representing the size of the skull, 
after capacity, are the cranial module and the circumference, the nasion-opisthion 
are offering greater variability. The necessity of measuring the thickness of the 
cranial vault in each case where the actual capacity can not be determined is 
apparent. This measurement, as taken in this series, 7. ¢., along a line 1.0 cm. 
above the temporo-parietal suture, is not perfect, but it has the advantage that it 
can be taken with the compass used for other skull measurements. It would be 
preferable to determine the thickness of the parietal along a line running from 
before backward nearer or at its middle, but this would require a special in- 
strument. 
Results of considerable interest are obtained by comparing the averages of the 
principal external measurements of the skull which relate to its size, in all the 
available collections from Arkansas and Louisiana, and by contrasting them in the 
two sexes. According to these averages, which also are given in the next table, 
the Louisiana crania, of both males and females, show the largest external dimen- 
sions, while those from the Menard and Greer cemeteries in Arkansas show the 
smallest. This result agrees in the main with the determinations relating to the 
internal size of the skulls. The differences, however, on the whole are very moder- 
ate, and it is quite probable that in at least some of the groups they are accidental, 
due to the small number of specimens. 
The average thickness of the skulls is in every series except that from Boytt's 
Field, Arkansas, noticeably smaller in the females than in the males, The male 
crania from the Menard and Greer cemeteries show the highest average thickness, 
but they are represented by only three specimens; the female skulls from that 
locality are not exceptional. The next in thickness are the male skulls from Louis- 
