1910-11.] The Place in Nature of the Tasmanian Aboriginal. 43 
9. The calvarial height foot-point positional index, that is, the relation 
which the distance of the foot-point of the calvarial height from the 
glabella bears to the glabella-inion length, the latter being taken 
as 100. 
10. The frontal angle. 
11. The bregma angle. 
12. The distance of the foot-point of the bregma from the glabella. 
13. The bregma foot-point positional index, that is, the proportion 
which the distance of the foot-point of the bregma from the glabella bears 
to the glabella-inion length, the latter being taken as 100. 
14. The length of the frontal arc. 
15. The length of the frontal chord. 
16. The curvature index of the os frontale, that is, the proportion 
which the length of the frontal chord bears to the length of the frontal 
arc, the latter being taken as 100. 
17. The angle of frontal curvature. 
18. The length of the chord of the pars glabellaris of the os frontale. 
19. The length of the chord of the pars cerebralis of the os frontale. 
20. The glabella-cerebral chord index, that is, the proportion which the 
length of the glabellar chord bears to the length of the cerebral chord, the 
latter being taken as 100. 
21. The length of the parietal arc. 
22. The length of the parietal chord. 
23. The curvature index of the os parietale. 
24. The angle of parietal curvature. 
25. The parietal frontal arc index, that is, the proportion which the 
parietal arc bears to the frontal arc, the latter being taken as 100. 
Schwalbe himself briefly calls this index “ der Scheitelbein-Index.” 
26. The lambda angle. 
27. The opisthionic angle. 
Our choice of these 27 observational factors has not been altogether 
haphazard. Many of the curved horizontal measurements we were 
prevented from taking by the non-arrival of the diagraph ; but even if 
this instum ent had arrived in time the owners of the crania would not 
have left their specimens in our hands for a sufficiently long period, as 
they all, with one exception, refused to allow the specimens to be trans- 
ported from Tasmania to Melbourne. Our observational field was therefore 
immediately restricted to the median sagittal plane, but upon this plane 
we have recorded practically all the observations which Schwalbe intro- 
duced in his investigation of Pithecanthropus. 
