882 H. H. NEWMAN AND J. THOMAS PATTERSON 
TABLE 10 
Showing coefficients of correlation and other constants in each of the nine bands of 
armor 
BAND MEAN ) ox? av anaes 
oN rE) ty IC ane Oe A ees 62.16 4.090 3.10 0.6201 
DR BOS Cm ater tr CA re eee 61.03 4.712 3.94 0.5820 
Shea Seu A Pee 60.05 5.887 3.80 0.6769 
Le Reged ree Ae sie eee scl See Shs ay Ae 60.45 3.972 3.93 0.5051 
Dee ALORS Mv te ee ee €0..97 4.828 3.41 0.6469 
Gis cote yen een es ae 61.73 4.970 2.52 0.7458 
hae pd dich ON Oak AAO RES 62.70 5.735 | 3.30 0.7123 
SS LG eg | MOE Be EE = WNP te eS ORD te 64.40 3) 1153) | 3.75 0.6363 
NRG AA Re Veg cy ts Ee ee ie 64 .22 5.875 3.66 0.6880 
IMME ait wy. Ve taney ects toe cee Pe bs Yate eee ae ee ae 0.6459 
region, where the rows are far from straight and where it is not 
always possible to assign scutes to their respective rows. At 
such a stage in the development of the banded region we may 
assume that the ultimate position of certain scutes is determined 
only in a general way, and whether or not they come to be aligned 
with one or the other of two adjacent bands is determined by fac- 
tors beyond the limits of hereditary control. Considering that 
the scutes are not only determined rather sharply for the whole 
region, but that, within this region, their primordia would also 
be regionally distributed under the influence of hereditary control, 
the coefficient of correlation is no larger than we should expect. 
But the correlation is so low as to preclude the possibility of any 
strong hereditary control being exercised over the assignment 
of scutes to particular bands. ‘This conclusion is in close harmony 
with that expressed by Wilder in connection with his studies of 
friction ridge patterns in human twins, and which is quoted in the 
introduction to the present paper. We might well ask with him: 
“Have we then arrived at the limit of hereditary control of the pre- 
determining mechanism beyond which mechanical laws are alone 
operative?’ Perhaps we are in a position to give with somewhat 
greater assurance than was Wilder, an affirmative answer to the 
question. 
