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of cases at least, from a case, or cases, escaping
recognition until several members of the family had
been infected.
Scarlet Fever is often of so mild a type that this
is liable to occur in some cases. Altogether, the above
analysis, though in many respects unsatisfactory,
cannot be wholly so regarded.
DIPHTHERIA.
Four hundred and thirty-three cases of Diphtheria
were notified during the year. This is the largest
number of cases notified during the last ten years, and
therefore the largest number yet notified in Willesden.
The mean for the last ten years is 238. The rate of
notifications of Diphtheria per 1,000 of the population
is 3 5; in 1901 it was 3.4, in 1898 it was 3.3, in
1893 it was 3.2, so, although the rate is the highest
yet recorded, it is only slightly in excess of what has
occurred in previous years, even so far back as 1893.
The least recorded rates for Diphtheria are 1.4, 1.6, and
2.1 for the years 1891, 1894, and 1896 respectively.
The incidence of Diphtheria on Urban populations
throughout the country is an increasing one. Its