78 
Measurements of Cairo-horn Egyptians 
p.e. is the probable error for each calculated measurement, and is computed 
from 
0-6745aj,w^ (1 - >-2)*/(n - 2)^', 
and c is a constant. 
All characters, stature included, are in millimetres. 
Besides the formulae given above, the following multiple regression equations 
for the determination of the stature may be of interest: 
Reconstruction of stature from a knowledge of one measurement: 
Stature = 6-3839 (Finger) + 929-9, 
Stature = 3-4304 (Foot) + 774-4, 
Stature = 2-2451 (Cubit) + 631-0. 
Reconstruction of stature from a knowledge of two measurements: 
Stature = - 0-2228 (Finger) + 2-2981 (Cubit) + 632-2, 
Stature = 2-6699 (Finger) + 2-4195 (Foot) + 730-2, 
Stature = 1-7136 (Foot) + 1-2034 (Cubit) + 564-2. 
Reconstruction of stature from a knowledge of three measurements: 
Stature = 1-4309 (Foot) + 1-9866 (Cubit) - 1-0166 (Finger) + 496-6, 
where all the values, stature included, are in millimetres. 
8. Summanj of Conclusions. 
(o) The raw material, though taken from the anthropometrical slips of 
prisoners, is a fair sample of the ordinary native community. 
(6) The natives dealt with are not of the poorest nor of the lowest class of the 
Cairo natives. 
(c) The records are homogeneous, and are sufficient in number for a good 
statistical study. 
{d) The distributions of stature, cubit, finger, etc., are normal. 
(e) The coefficients of correlation between all organs are significant, no matter 
to what race the records belong. 
(/) The variabiHty between the human organs is not chaotic, but governed 
by definite laws which enable us to predict measurements one from another. 
{g) The coefficients of correlation for the human organs are practically identical 
from one race to another, only the coefiicients resulting from the head measure- 
ments vary to any great extent. 
(h) The great variation which the coefficient of correlation for the head 
measurements undergoes from race to race, is to be traced to special factors not 
yet determined, which influence this measure of relationship. I hope to in- 
vestigate this further. 
