STATISTICS: R. PEARL 
597 
figure 1. Tables 2 and 3 give upper and lower limiting values to the 
death rates chargeable to ectoderm and mesoderm. The difference 
between the two depends upon the placing of deaths due to cerebral 
hemorrhage and apoplexy, and to ' softening of the brain' . The discussion 
of the embryological and pathological problems involved cannot be given 
here by reason of lack of space. The complete paper must be consulted. 
53. 9 ^/o 
53.9 %• 
'31.8% /4.3. ir\ 
us. REGISTRATION AREA ~ 1306 -lO 
[ Z3.0%-= 
^ 15.0 % 
%= 34.2%-^ 
as. REGISTRATION 
AREA - I90/-S 
: .. 55. J % ■ 
^^=.30.3%"= 
55.J7c^ 
f:. 36.0%~ 
^^8.7% 
ENGLAND a^d WALES - 13/4- 
or.. 6 
1 290 %^^.4% 
6^.6 % 
3// %^^5.3% 
SAO PAULO - sn 
Endodepm 
MESODERM 
CD 
ECTODERM 
FIG. 1. DIAGRAM, SHOWING THE PERCENTAGES OF BIOLOGICALLY CLASSIFIABLE HUMAN 
MORTALITY RESULTING FROM BREAKDOWN OF ORGANS DEVELOPING 
FROM THE DIFFERENT GERM LAYERS 
Upper bar of pair gives upper limit of mortality chargeable to ectoderm; lower bar 
gives lower limit of mortality chargeable to ectoderm. 
The data of tables 2 and 3 are shown graphically in percentage form 
in figure 1 . 
The final results lead to a generalization of considerable interest and 
significance to the evolutionist. The figures show that in man, the 
highest product of organic evolution, about 57% of all the biologically 
classifiable deaths result from a breakdown and failure further to function 
