42 
Proceedings of the Royal Society of Edinburgh. [Sess. 
relative extent and degree of projection of the pars glabellaris of the 
cranium ? I do not think that we can, and I look upon the figures given 
.... as being of little value, and in certain respects misleading.” 
Giufrida-Ruggeri (5) has also expressed dissatisfaction with Schwalbe’s 
glabello-cerebral index, as well as with certain other of Schwalbe’s investi- 
gational methods (6), such as the bregma angle, the parietal index, the 
bregma positional index, etc. 
These criticisms notwithstanding, it must be borne in mind that even 
Schwalbe’s critics admit the great value of his work. That work further 
provided us with much of the required data for our comparison of the 
Tasmanian aboriginal, and, above all, was readily accessible in Melbourne — 
for all of which weighty reasons our selection of Schwalbe’s methods as our 
investigational basis is amply justified. 
The material upon which our investigations have been carried out 
comprises a series of 52 Tasmanian crania, 41 of which have never been 
examined by anyone, nor have any of them ever previously been subjected 
to Schwalbe’s methods of “ form analysis.” The whole of this material we 
have now made available to scientists in all parts of the world in our 
recent publication, “ Dioptrographic Tracings in Four Normse of Fifty-two 
Tasmanian Crania” (7). For reasons already mentioned in our recent 
works (1 and 8), the present series of observations has been limited to those 
which can be observed upon the median sagittal tracing, or, in other words, 
upon a dioptrographic tracing of the norma lateralis. Of such observations 
we have recorded 27 upon every skull, or at all events upon every skull the 
preservation of which permitted such observations to be carried out. 
These 27 observations are as follow : — 
1. The glabella-inion length. 
2. The calvarial height. 
3. The calvarial height index, that is, the proportion which the calvarial 
height bears to the glabella-inion length, the latter being taken as 100. 
4. The greatest breadth. 
5. The calvarial height-breadth index, that is, the proportion which the 
calvarial height bears to the greatest breadth, the latter being taken as 100. 
6. Half the sum of the glabella-inion length and breadth added 
together. 
7. The calvarial height half sum glabella-inion length plus breadth 
index, that is, the proportion which the calvarial height bears to the half 
sum of the glabella-inion length plus breadth, the latter being taken as 100. 
8. The distance of the foot-point of the calvarial height from the 
glabella. 
