872 H. H. NEWMAN AND J. THOMAS PATTERSON 
In order that it may be clear that the sample of the species 
presented by the sets of foetuses studied is fairly representative, 
it would be well to compare the variation constants of the foetuses 
with those of the large sample of the species here dealt with. 
Table 5 furnishes the means of comparison. This table reveals 
to the student of biometry a number of interesting conditions not 
strictly pertinent to the present inquiry, but doubtless worth 
noting briefly : 
1. With a few minor exceptions, all of which fall within the 
limits of probable error, there is a gradual decrease of the mean, 
mode and median from the first to the fourth band and then a - 
gradual increase in these constants from the fifth to the ninth 
band. 
2. The absolute variability, as indicated by the coefficient of 
variation is greater in each of the bands than in whole banded 
region. 
3. The proportional range of variability is likewise greater for 
the individual bands than for the banded region as a whole. 
4. The standard deviation may be considered for convenience 
to amount to two scutes. This will be worth remembering when 
we come to study the band correlation among the foetuses of 
the various sets. 
For the convenience of the reader it seems well to consider the 
subject of hereditary control, as it is exhibited in connection with 
TABLE 5 
Showing the variation constants of the individual bands of 508 adults 
| ] . 
| | RANGE IN 
BANDS | MEAN fees MODE | aslo ba parce ea | press 
dl. eee | 62 +0.066 |. 62 62.0 2.223+0.047 | 3.59+0.0388 | 24.19 
Di nceee | 60.55+0.065 61 61.9 2.217+0.046 | 3.66+0.038 | 23.3 
Oekacees | 60.44+0.063 60 61.76 2.12+0.045 3.51+0.037 | 26.46 
7 ae 60.23+0.062 60 60.92 2.08+0.044 3.45+0.035 24.9 
Die aw 61.16+=0.063 61 61.64 2.11+0.045 3.46+0.085 | 24.54 
Goaeeee 61.85+0.066 | 62 62.3 2.23+0.047 | 3.61+0.039 | 29.1 
Aveo oats 8 | 63.09+0.066 63 62.82 2.22+0.047 | 3.52+0.037 | 20.6 
cia eae | 64.43+0.068 | 64 63.14 2.24+0.048 3.49+0.036 26.39 
9.......| 64.44+0.068 | 64 63.12 2.2 +0.046 | 3.57+0.038 | 23.27 
