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within 2 days of each other, and the commonest interval between
the first and second cases was again 8 days. The following figures
give the number of times the interval between the onset of the
first and second cases was 4 and subsequent days:—8, 8, 6, 6,
25,11, 8, 6, 3, 11, 2, 1, 1, 4. In 72 instances the second and third
cases fell ill within 2 days of cach other, the following numbers being
the number of times the interval between the onset was 4 or more
days:-6, 2, 6, 4, 10, 4, 13 and 3 cases over 11 days.
There were 29 instances in which four members succumbed to
infection. In 3 of these, all four fell ill within two days of each
other. In 10 the disease, introduced by the first child, attacked
the remaining three at one time, after an interval of 8 to 14 days.
In 6 instances, two fell ill together and the other two together after
an interval of 8 to 12 days ; and in one case two children fell ill
simultaneously, but the onset of the illness of the others was
separated by an interval. In 5 cases the order was 1, 2, 1; in 2 it
was 1, 1, 2 ; in one 2, 1, 1 ; in one 1, 1, 1, 1 ; and in one 3 and 1.
Of the 9 eases where five members were affected, the order
was 1, 2, 2 in three instances; 1, 3, 1 in three; 1 and 4 in two;
and 2, 2, 1 in one.
In the single instance where six members were attacked, the
order was 1, 2, 3.