XIV, 3 Acosta-Sison ami Calderon: Pelvimetry 267 
diminution is most marked in the fronto-occipital and suboc- 
cipito-bregmatic diameters whereas the mento-occipital dia- 
meter is almost the same in both cases. 
The figures in Table VIII are self-explanatory. As in other 
nationalities, the multipart have a shorter duration of labor, 
and longer and heavier babies than those of the primiparse; 
also, the female babies are smaller than the male. The influence 
on the birth weight of the baby of a week’s sojourn in the hos- 
pital before confinement is here well shown. The difference in 
the average birth weight of the babies whose mothers stayed 
one week or more in the hospital before parturition and those 
whose mothers entered the hospital on the day of, or a few days 
before, confinement is 139.35 grams in favor of the former. 
Table IX . — Average length of labor and duration of second stage in normal 
spontaneous deliveries in multiparse. These form 92.307 per cent of 
780 cesses of multiparse. 
PoBition. 
Cases. 
Lengrth of labor. 
Length of second 
stage. 
Aver- 
age. 
Least. 
Long- 
est. 
Aver- 
age. 
Short- 
est. 
Long- 
est. 
H. m. 
H. m. 
H. r,i. 
H 77L. 
H. 7n. 
H. m. 
L. 0. A 
614 
9 01 
1 00 
48 00 
0 52 
0 10 
4 00 
R. O. A 
75 
12 05 
2 00 
48 00 
1 02 
0 15 
3 00 
L. O. P 
23 34 
6 40 
60 00 
1 33 
R. 0. P 
13 
28 55 
4 20 
72 00 
1 31 
0 20 
3 00 
R. 0. T 
6 
27 14 
7 00 
72 00 
1 40 
0 40 
3 00 
Breech presentation 
7 
10 38 
8 00 
15 00 
1 18 
0 20 
0 20 
From Table IX it is evident that, as in women of other coun- 
tries, the duration of labor and of the second stage in anterior 
vertex presentations is shorter than in the posterior or trans- 
verse vertex presentations. Moreover, the length of labor in 
left occipito-anterior position is shorter than the duration of nor- 
mal labor as taught in most American obstetrical text-books. 
The data in Table X indicate that the frequency of the dif- 
ferent fcetal presentations is much the same as in other coun- 
tries; only that, in vertex presentations, there is a relatively 
high percentage of those which occur in the left, those occurring 
in the right being correspondingly diminished. 
The twenty-seven Cesarean sections performed in the obstet- 
