MR. K. PEARSON ON THE MATHEMATICAL THEORY OF EVOLUTION. 409 
If we investigate the areas of our infantile mortality curve, we have the following 
deaths :— 


Theory. Statistics. | 
Ist yearoflife. . . . 156°2 158°5 | 
2nd year of life .. . 53°5 | 51:2 | 

After this the mortality of childhood begins to sensibly increase the infantile 
mortality. Turning to the “ antenatal” portion of the curve, we have the following 
results, of course not verifiable from ordinary mortality statistics :— 
(i.) The total “antenatal” deaths for the 9 months preceding birth are 605 for 
every 1000 actually born and registered. 
(u.) “ Antenatal” deaths for the 6 months immediately preceding birth are 214 for 
every 1000 born. 
(iii.) ‘‘ Antenatal” deaths for the 3 months immediately preceding birth are 83 for 
every 1000 born at the proper period. 
The 391 “deaths” of the first three months of pregnancy would not be recorded, 
and in many cases possibly pass without notice. The 214 deaths of the remaining 
six months would be considered as miscarriages or still-births. The proportion of 
1 in 6 of such accidents to births of the normal kind does not appear excessive, On 
the average Dr. GALAPIN says such an occurrence is ‘“‘ the experience of every woman 
who has borne children and reached the limit of the child-bearing age.” So far then 
there appears nothing to contradict our theoretical results in what is known of the 
first six months of antenatal life. 
For the last. three months we have more definite data. According to our curve 
we have 83 deaths (per 1000 born) in the last three months before birth, or 83 in 
1083 pregnancies = about 7°7 per cent. Now this percentage must consist of two 
factors—still-born children and children who, born before their time, die shortly 
after birth, and who would not be recorded in any proper proportions in statistics 
based on census returns, nor as a rule in the returns of maternity charities. 
For statistics of still-births, I find: 
per cent. 
Dublin Rotunda Hospital: (1847—54)) es 6 
is . (87 t= 7) gen ey ll Selanne 
Dra Jeg Diagn for 14,000 births for a large thabernity charity 
in St. Paneras. . . 4 
Guy’s Hospital Lying-in Clanieys 25, 777 dices, up 127 oe 
dead or died within a few hours, 1000 corresponding to 
births in the last three months of pregnancy. . . . . 3°84 
NewsHoime’s “ Vital Statistics” (no authority cited) . . . 4 
MDCCCXCV.—A. 3G 
