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freedom from the disease. The annual average for the ten
years preceding 1900 was 500. The following shews the
number of cases notified during each of the years 1890-1900.
1890 349
1891 260
1892 366
1893 682
1894 504
1895 411
1896 426
1897 614
1898 791
1899 606
1900 306
Annual average 10 years 1890-9 500
Periodical Distribution. — The distribution of the disease
during the year was remarkably equal, the monthly average
being 23-5 cases. The extreme variations from the monthly
average were the first four weeks of June, when only ten
cases were notified, and the month ending the 10th March
when 40 cases were notified. The weekly extremes were those
ending May 12th and March 20th. In the former week no
cases were notified, and in the latter fourteen.
Age Distribution.—Children between the ages of five and
fifteen years contributed the largest number to those attacked
with Diphtheria. The following are the numbers for the
various age periods: Under one year of age, four; from one to
five, one hundred and ten ; from five to fifteen, one hundred
and thirty-four; from fifteen to twenty-five, thirty; and from
twenty-five to sixty-five years, twenty-eight.
Local Distribution.—As in the case of Scarlet Fever, the cases
of Diphtheria are almost exactly equally distributed between the
two divisions of Battersea. In East Battersea one hundred and