Chapter LIII: Munsee Tibiæ: Shape of Shaft at Middle66

-------+------+------+------+------+------+------+-----
| 1 | 2 | 3 | 4 | 5 | 6 | I
-------+------+------+------+------+------+------+-----
|_Per_ |_Per_ |_Per_ |_Per_ |_Per_ |_Per_ |_Per_
|_cent_|_cent_|_cent_|_cent_|_cent_|_cent_|_cent_
Males | 11 | 13.5 | 7 | 24 | 3.5 | — | 41
Females| 44 | 11 | — | 15 | 3.5 | — | 26
-------+------+------+------+------+------+------+-----

[63] (Right + left)/2

[64] (Right + left)/2

[65] (Diameter antero-posterior + diameter lateral, right and left.)/4

[66] 1 = ordinary prismatic; 2 = lateral prismatic; 3 = external surface concave; 4 = posterior surface divided into two by vertical ridge; 5 = interior border indistinct, posterior half of bone oval; 6 = plano-convex; I= indefinite.

It is interesting to note that in the female Munsee tibia, type 1 is decidedly frequent and much more common than in the males; type 3, which is usually associated with considerably developed leg muscles, is absent in the females; type 4 is relatively frequent in both sexes; type 6 is wholly absent.

In the next table are shown for comparison the proportions of the different types found by the author in different racial groups. For the purpose of elucidating these data, both sexes are taken together. It is seen that well-differentiated type 1 is most common in the Indians; that type 2 is relatively scarce in the negro; type 3, most common in the white (laboring class), was not met with in a pronounced form in the negro; type 4 is decidedly more common in the Indian than in the other two races; and type 6, absent in the Indians and rare in the whites, is fairly frequent in the negro. These differences show that the shape of the shaft of the tibia, as that of the femur, humerus, and other bones, has a considerable racial significance, which, as our data are increased, will doubtless become accentuated.