6th. The dorsal part, the iliac, tuberosity, is much more developed and sharper in man.
7th. In woman the spines of the pubes are further apart.
8th. In the latter all the diameters of the superior strait are greater than in man. The difference is specially noticeable in the transverse diameter.
9th. In a female pelvis the superior strait is rounder; this follows in part from the increase of the maximum transverse diameter, and in part from the position of this diameter, which is further forward than in man.
10th. In the latter the great sciatic notch is narrower and deeper.
11th. In man the apex of the sciatic spines is sometimes inside of the postero-inferior iliac spines; in woman it is always outside.
12th. The distance which separates the sciatic spines is rarely greater than 4 inches in man, it nay even be below 3 inches.
13th. In woman the distance between the sciatic spines often exceeds 4 inches, and is never less than 3 inches.
14th. The antero-posterior diameters are only a few hundredths of an inch long.
15th. The pubic angle is greater in woman for woman, 58° for man. ) 16th. The apex of the above angle is rounder in the former. The ischio-pubic tubercle is pointed outward, and the ischio-pubic ramus is concave near its middle.
17th. In woman the sacrum and coccyx are lower and flatter.
18th. The acetabulum is smaller and faces less backwards and inwards. 19th. The distance of the two cotyloid cavities is greater when they are measured internally, and smaller when measured to the ilio-sciatic notches.
20th. The sub-pubic canal is oval in man, triangular in woman. It is relatively larger in the latter and slopes more outward and downward. 21st. The distance between the ischia is greater in woman.
2t3d. AU the vertical diameters are greater in man.
23d. The total height of the pelvis in man is, on an average, 8 inches, while in woman it is but 7.6 inches.
24th. In the male pelvis the distance from the sciatic spine to the highest point of the iliac crest reaches, on an average, 6.5 inches; hi the female pelvis it is only about 5.8 inches.
25th. The distance from the sciatic spine to the antero-superior iliac spine is, on an average, in woman, 5.3 inches; in man this average reaches 5.8 inches, a figure which the maximum distance in the former never
reaches.
26th. The interval between the antero•superior iliac spine and the in ferior part of the ischium is 6.4 inches in the pelvis of a woman, and averages 7 inches in that of a man. The maximum in the former never attains this last figure.
HI. the new-born child the differences of sex are not well marked. The alas of the sacrum are extremely small compared to that of the vertebra; the ale are also nearly straight. The anterior face is more concave transversely, its inclination is less, and it is not set so deeply between the iliac bones. The horizontal rami of the pubes are extremely short. The iliac al.% are straighter; the distance which sepa rates the iliac spines is equal to that which separates the crests. The diameter A P equals or exceeds the transverse diameter.
As for the causes which lead to the transformation of the pelvis of the new born into the adult pelvis, the first is the development of the sacrum, and particularly its wings; then follows the weight of the trunk on the feet. This tends to force the sacrum into the pelvis; but since the cen tre of gravity of the trunk is in front of the supporting point of the sacrum, this bone makes a rotatory movement on its axis which lowers the promontory, and has a tendency to throw the point of the sacrum back ward. Now this point is held by ligaments, therefore the sacrum ought to curve on its anterior face.
Pajot observes, it is especially in the two extremes of the human scale that the most striking differences and distinctions are to be found:—namely in the white race, on the one hand, and the Ethiopian negro, on the other. V rolik, Dubois and Pajot, Joulin, Verneau, the Anthropological Sobiety, Reynaud and Rey, have published interesting works on this question. We will confine ourselves to referring the reader to Figures 17 to 22. They represent the various forms of the superior strait of the women of different races, showing the differences which characterize the pelvis, taking the French as a common European type, down to the negroes and the Bosjesman.