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remained exceptionally low. In 1937 the incidence remained low
until October, when it rose sharply, reaching a maximum the
week ending November 6th with 21 cases notified. The weekly
average of cases was 5.
Whooping Cough.—From being inconspicuous in 1924, the
curve rose gradually to a maximum in May, June and July, 1926,
then fell rapidly to a minimum in November and December, then
rose very gradually to a lower maximum in September, 1926;
once again the curve fell abruptly to a minimum in January, 1927,
rose in June and July, and fell again gradually to a minimum in
November and December, then rose steadily to the highest level
of the period under review in January, 1929, from when it fell
steadily to the end of the year. Throughout 1930 it remained
quite inconspicuous, until December, when there were indications
of the commencement of a wave of increased incidence which persisted
in 1931 until the end of July, after which the number of
cases dropped considerably. December showed a small rise in
cases. A wave of increased incidence occurred in 1932, commencing
the second week in April and persisting until the end of
July. Two small waves showed themselves during 1933, the first
commencing early in February and persisting until the beginning
of August; the second beginning in late October and continuing
until the end of the year. In 1934 two waves were also experienced;
the first with its peak at the end of January, and the
second with its peak at the middle of April. From then a
moderate incidence was present until the beginning of August,
when the numbers dropped rapidly, the incidence remaining very
low for the rest of the year. In 1935 the incidence of Whooping
Cough rose in a series of sharp waves throughout the year. In
1936, this zymotic maintained an average of some 20 cases brought
to the notice of the Department each week. There was a slight
decline in incidence towards the end of the year. During 1937,
the incidence was moderate during the first half-year, but it fell to
very small dimensions during the second half. The highest
number of cases in a week was 33 during the week ending February
27th.
Measles was very prevalent in April and May, 1924, then
dropped suddenly, but showed a small rebound during September,
October and November, after when it died away until a
sudden rise in May, June and July, 1925, and was followed, after
a fall, by a further and more prolonged rise from October, 1925,
to May, 1926. During 1927 there was very little Measles in
Croydon; a small rise in October, November and December,