6 25.8 23.6 3.0 27.6
Allowing for the smallness of some of the groups, it is evident that
the amount of correlation is about the same here as among the English
Quakers of the Beeton-Pearson investigation, whose mortality was shown
in the two preceding tables. In the healthiest group from the royal
families--the cases in which the father lived to old age--the amount of
child mortality is about the same as that of the Hyde family in America,
which Alexander Graham Bell has studied--namely, somewhere around 250
per 1,000. One may infer that the royal families are rather below par in
soundness of constitution.[193]
All these studies agree perfectly in showing that the amount of child
mortality is determined primarily by the physical constitution of the
parents, as measured by their longevity. In the light of these facts,
the nature of the extraordinarily low child mortality shown in the 340
families from the Genealogical Record Office, with which we began the
study of this point, can hardly be misunderstood. These families have
the best inherited constitution possible and the other studies cited
would make us certain of finding a low child mortality among them, even
if we had not directly investigated the facts.
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