REMAINS, FROM ARKANSAS AND LOUISIANA. 
diameters at the middle of the shaft. 
219 
These diameters,’ as determined by the 
writer In nearly 2000 normal adult bones of whites,? produce for the antero-posterior 
dimension in the males an average of 3.13 em. on the right, and 3.14 on 
while in the females it is 2.72 em. on the right and 2.57 e. m. on the left. 
the left; 
T1BIA—LENGTH ; DIMENSIONS AND INDEX AT MIDDLE; TIBIO-FEMORAL INDEX 
| Num- | Av length N М у i „1 N A А ' 1 Б | Ч ^ 
ex | Qu, РУМИ Num; | Average dam Num: | Average | Num: | Average | Nom; | average 
and Locality қ speci- length less | speci- | posterior at | speci lateral speci- of shaft — | speci- | tiblodemoral 
, mens spine) mens mí mens at middie mens at middle | mens | index 
Шам та a ЛЫР at Li d NR » | es 
Males cm. cm. cm, | 
| EN Ix 345 2 67 | 821 
Right 7 | 9 я dr + * 
Arkansas : Pr | (36.4-41.6) (3.2-3.85) " (1,95-2,45) Š (51.9-81.7) | 5 | (79.8-85.9) 
Boytt’s Field | | | 
1 BIN MI vs 9 35 9 22 8 36 | 5 414 
4 | (35.0-41.6) (2.85-3.8) (2.0-2,35) (52.6-82.3) | ° | (79,0-85,4) 
| | | 
Ww" | | 2 » 4 » | Y 
| Ri ht | 37.10 : - 3 а о - 242 ~ 68.45 | 84,2 
m | Right) 13 laos) 17 | (2.83.7) | 17 | (1926) | 17 |(566-786)| 9 | (70.8-88.6) 
Louisiana | < | | | | 
| 37.08 | ОА, . L 22 68.5 84,3 
Le | ~ | Р 
| tt 13 (30540,8). V | (293.7) | Y | (18-29) | 17 | (56.8-79.3) * | (81.1-96.6) 
| | | | | | | 
NONSE Е | 33.15 “е, BENE S A | 682 | 82.7 
Arkansas: \ "— | (33.1-33.2) ы | (2.75-2.9) 4 (1.85-2.05) | 4 |(63.8-78.2) | 2 | (80.1-85.4) 
Boytt's Field | | | 33.15 2,8 | 2,0 69,8 | 820 
| Left 2 | (32.7-388.4) 4 | (2.7-2.95) 4 (1,8-9,3) | 4 | (66.1-78.0)| 2 | (80.5-83.7) 
| | 
viet S. P P. 1.9 64.5 84.3 
| Right) 10 | (32.2-37.8) | 9 | (2.6-3.06) 9 | (1.65-2.05) | 9 | (56.0-70.2) | 6 | (81,9-88.2) 
Louisiana a | 
| ЕКЕ 2.9 L"- Zu 63.9 83,5 
Left | 10 | (32.3-37.6) | 9 | (2.65-3.1) | 9 |(1.55-2.05)| 9 | (55.3-71.7)| 6 | (80.8-86.5) 
The lateral diameter of the tibia averages in white males, on the right side 
2.24 ст., on the left 2.20 ст.; in the females, on the right 2.05 ста., and on the 
left 1.86 em. This dimension gives a breadth-height index of the shaft of the tibia 
of 71.1 in the white males and 71.9 in the white females. In the Indians the 
antero-posterior diameter in all the series is somewhat superior to that in whites, 
while the lateral dimension averages equal or smaller. This gives rise to a smaller 
index of the shaft, expressing greater platyenemy in the Indian. Comparisons as 
to locality, sex, and side, in the two Indian series, are not satisfactory, due to the 
small and irregular number of specimens. 
As to the shape of the shaft of the tibia, the ordinary prismatic is found to 
prevail, but lateral prismatic shafts are also quite numerous. A large proportion of 
the tibiae, however, show a shaft characterized by pronounced concavity of the 
external surface in the region of the tibialis anticus muscle, while numerous others 
! The antero-posterior diameter is the maximum measurement, the lateral diameter being that at 
a right angle to the antero posterior axis of the bone. The latter is taken in such a way that the 
anterior border of the tibia lies on the rod of the sliding compass in the middle of its opening. 
* See “Study of the Normal Tibia,” The American ea October, 1898, p. 307 et seq. ; 
also Proc. Assoc. Amer. Anatomists, 11th Annual Session, New York, 1898. | 
