380 
Proceedings of the Royal Society 
The mean sacral index of twenty-nine Negros, measured by 
Verneau, Spengel, B. Davis, and myself, was 106, i.e ., they were 
platyhieric ; whilst the mean of ten Negresses, measured by Yerneau, 
Fritsch, and myself, was only 98*8, so that they were dolichohieric. 
If these specimens give a correct average for the Negro race, it would 
seem as if the sacrum is not so broad in the women in proportion to 
its length as in the men. 
In eight male Andamanese measured by Flower, the mean sacral 
index was 94; hut in a single adult male measured by myself it was 
114, and in a young male 1 06. In nine females measured by Flower, 
the mean sacral index was 106 ; in three adult females measured by 
me it was 111, and in a young female it was 9 6 ‘5. The high index 
of my male Andamanese is probably exceptional, and the standard 
of the race is dolichohieric. 
Three male Tasmanians, measured by Barnard Davis, had a mean 
sacral index 87, so that they were dolichohieric. In a single female 
the index was 104. 
From measurements of the sacrum in Pacific Islanders, both 
Polynesians and Melanesians, or perhaps a mixture of the two races, 
made by Yerneau, Barnard Davis, and myself, the mean sacral index 
was above 100, so that its proportions were platyhieric. 
The number of sacra belonging to the Guanche and Esquimaux 
races, which have as yet been measured, is too few to frame an 
average on ; but from a few specimens measured by Yerneau and 
myself, it is probable that the mean proportions of this bone are 
platyhieric. In the Hindoos and Sikhs also my measurements 
would point to a platyhieric bone. 
The information regarding the proportions of the sacrum in the 
Chinese or other Mongolians is too scanty to enable one definitely 
to classify this bone. From measurements of the sacrum in male 
Malays by B. Davis and myself, it is probable that the bone is 
dolichohieric. 
From the observations of von Franque, Barnard Davis, and 
Verneau on the sacrum in North American Indians, and from the 
measurements of Yerneau, Davis, and Garson on South American 
aborigines, it seems probable that the sacrum in them is platyhieric. 
Although additional observations are needed on the sacrum in a 
larger number of individuals of many of the races, yet from the 
