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131
If the history be taken in the direct line only, that is, including
those cases in which either grand-parents or parents had died of
consumption, or either of the parents were suffering from consumption,
we get the following figures:—

This table gives 8 per cent. of the children as having a distinct
history of consumption on their mother's side,- and 5 per cent. on their
father's side, and .7 per cent. on both mother's and father's side. Here
again, if there were no correlation we should expect the number of cases
with a consumptive history on both sides of the family to be 9.9, instead
of 17, the actual number. Thus, there seems to be a tendency for
persons with a consumptive family history to intermarry.

The number of children with a history of consumption on their
mother's side is fifty per cent. more than the number with consumption
on their father's side. This, however, is no doubt due to the fact that
information is usually obtained from the mother, who naturally knows
more of the history of her own family than that of her husband.
History of Previous Illnesses.
Details of previous illness were obtained for 2,372 children.
The incidence of previous illness for the commoner diseases of
children are given for the four ages of 5-6, 6-7, 10-11, 13-14, and for
all ages.