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52
was 40 during the week ending November 24th. The weekly
average of cases throughout the year was 19.5, being 9.0 higher
than in 1933.
Diphtheria.—During 1924 there was a small but steady incidence
throughout the year; in 1925 a trough occurred in the curve
and very few cases were notified, but towards the end of the year
the notifications began to increase steadily, the curve reaching
its apex in November and December, 1926; the curve then
declined through 1927 until the last quarter, when the trend
became upwards once more, reaching its apex in January, 1928;
this was followed by a slight fall, followed by a slight rise until
December, 1928, when another fall commenced, reaching its
minimum in July, 1929, from when the curve rose steadily to its
maximum in November. In 1930 Diphtheria was not troublesome,
though there was a small rise in the number of cases in
October, reaching a maximum of 22 during the week ending
October 18th. In 1931 the highest number of cases arose in
February and the last two weeks of March. In 1932 there was a
slight rise in March and again in mid-September and the end of
November. During 1933, there was a steady upward trend in
incidence as the year advanced, with only a slight remission
during April and May; a small wave of increased incidence
spread over the first half of the year and was succeeded by a more
intense wave covering October, November and December. The
weekly average of cases was 8.4 as compared with 4.1 in 1933.
Whooping Cough.—From being inconspicuous in 1924, the
curve rose gradually to a maximum in May, June and July, 1925,
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