170 Proceedings of the Royal Society of Edinburgh. [Sess. 
they are those uniformly recorded in the Osteological Catalogue of the 
Royal College of Surgeons of England, and have, therefore, enabled us to 
make use of any further comparative data which we desired — an oppor- 
tunity of which, as will be seen later, we have availed ourselves. 
It will be noticed that one measurement, and one only, is common to 
the 32 form analysis counts and the 14 general craniological observations, 
and that is the maximum breadth. We have, however, availed ourselves 
of an increased number of Tasmanian skulls under this count from one of 
our previous communications, and this fact explains the slight divergence 
in the results obtained. 
The total number of observations now available — namely, 46, composed 
Fig. 5. — The Tasmanian Variation Index for 14 craniological observations 
plotted out upon the Australian as the basis. 
of the 32 form analysis counts and the 14 craniological observations — is the 
largest number which has yet been employed for the working out of 
Mollison’s variation index. Mollison himself only employed some 24 
observations, Czekanowski about 28, Oppenheim 8, and Radlauer 20. 
In fig. 5 these 14 general craniological observations are set out with 
the Australian as the base. The Tasmanian variation index is plotted 
out in a dotted line, and the results conform in every respect to those 
already obtained by the 32 form analysis figures. In all cases the varia- 
tion index falls altogether within the maximum and minimum range of 
variation, thus again proving conclusively, according to Mollison’s method* 
that Australian and Tasmanian are one and the same race. 
