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in October, November and December, however, heralded a very
big incidence of cases—the highest during the period under review
—daring the first six months of 19-28. Practically no cases occurred
after this exacerbation, until March, 1929, but during this month,
and April, May and June, 1929, a number of cases occurred from
when the incidence dropped away until the end of the year. Another
wave of considerable intensity commenced abruptly during the last
week of February, reaching its maximum in the second week of
March and dying away gradually until terminating at the end of
June. The measles waves therefore were as follows: the first half
of 1924, the second half of 1925, and first quarter of 1926; first half
of 1928, the first half of 1929 and the first half of 1930. The
characteristics of the Measles curves were their abrupt rises and
rather less abrupt falls.
Chicken Pox.—A small wave of cases occurred during the first
half of 1924, followed by a higher wave covering the last quarter
of 1924 and the first half of 1925 ; another irregular wave was
experienced during the first half of 1926, followed by a secondary
in the last quarter. During 1927 and 1928 there was a fairly high
and steady incidence with a peak in October and November, 1927.
Another wave came during the latter half of 1929 with its maximum
in December; this wave continued into 1930, gradually declining to
a minimum at the end of July. Another wave commenced in
November and continued until the end of the year.
Mumps occurred in a series of waves from 1924 to 1928 inclusive,
but was not at all prevalent in 1929. In 1930, however,
a rather severe incidence was noted throughout the first half of the
year. The waves showed their maxima in March, 1924; May,
192-5; March, 1926; May, 1927; March, 1928 and May, 1930, and
their minima in September, 1924; September, 1925; September,
1926; and September, 1927.