G4 BUREAU OF AMERICAN ETHNOLOGY [ BULL. 62 
It will be observed that, as is usual with other parts of the skeleton, 
the male bone is somewhat larger than the female; also that the 
right os calcis averages very slightly larger than the left in length 
and breadth, but is equal in both sexes to that of the left side in 
height. Reducing the three average measurements to a mean diam- 
eter, or module, we obtain for the males on the right, 4.97 em.; on 
the left, 4.95 cm.; for the females, right, 4.45 cm.; left, 4.43 cm. 
showing that the difference in the mass of the bones on the two sides 
is very small. 
The three measurements of the os calcis give rise to two indexes: 
one expressing the percental relation between its breadth and length, 
the other showing a similar relation between its breadth and height. 
The breadth-length index is somewhat higher in the males than in 
the females, but in the paired bones does not differ very appreciably on 
the two sides. Taking all the bones, as in the next table, we see that 
the index in the males predominates slightly over that in the females, 
which, judging from the constancy of the condition in the several 
series of specimens used for comparison, is probably also the true 
condition in the Munsee. It indicates a tendency in the males 
toward not only absolutely but also relatively slightly thicker calea- 
neus. 
The breadth-height index, like the breadth-length proportion, is 
also slightly higher on both sides in the males than in the females, 
and in both sexes on the right than on the left side. As the height 
is the same on the two sides, this shows exactly the shghtly greater 
relative thickness of the bone in the males than in the females, and 
on the right than on the left side. The phenomenon is doubtless con- 
nected with difference of stress to which the bone is subjected in the 
two sexes and on the two sides of the body. 
The comparative data given in the following table show that, as 
with many other bones of the body, the os calcis in the Munsee and in 
other Indians in both sexes, and especially in the males, is smaller in 
all dimensions than it is in the whites. The relative proportions of 
the bone are quite alike in the different racial groups of males, but 
differ in an interesting way in the females, in which, among the whites, 
the bones show lower indexes than in the other groups. The white 
female os calcis is longer and higher, but equal in slenderness to that 
of the Indian. 
