Such unfitness makes more probable an
inheritance of low intelligence.
Evidence of natural selection was gathered by Karl Pearson from another
source and published in 1912. He dealt with material analogous to that
of Dr. Snow and showed "that when allowance was made for change of
environment in the course of 50 years, a very high association existed
between the deaths in the first year of life and the deaths in childhood
(1 to 5 years). This association was such that if the infantile
death-rate _increased_ by 10% the child death rate _decreased_ by 5.3%
in males, while in females the _fall_ in the child death-rate was almost
1% for every 1% _rise_ in the infantile death-rate."
To put the matter in the form of a truism, part of the children born in
any district in a given year are doomed by heredity to a premature
death; and if they die in one year they will not be alive to die in some
succeeding year.
Lately a new mathematical method, which is termed the Variate Difference
Correlation method, has been invented and gives more accurate results,
in such an investigation as that of natural selection, than any hitherto
used. With this instrument Professor Pearson and Miss Elderton have
confirmed the previous work.
Pages:
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214