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the year. The measles waves, therefore, were as follows: the
first half of 1924, the second half of 1925, and the first quarter of
1926; the first half of 1928, the first half of 1929, the first half of
1930, and the first half of 1932. Measles was rather prevalent
during the first quarter of 1933, dropping rapidly during the
second quarter and not becoming noticeable again until December.
The characteristics of the Measles curves were their abrupt rises
and rather less abrupt falls. Measles was again prevalent during
the first half of 1934 with peak incidences in February and May.
A very rapid decline at the end of July was followed by a low
incidence for the rest of the year. In 1935 a minor wave occurred
during February and March, and then declined until early in
November, when there was a sudden sharp rise which reached its
maximum at the end of the year. This foretold the severe epidemic
which swept over Croydon during the first quarter of 1936. This
epidemic came to an abrupt end in the middle of April, and
throughout the rest of the year practically no cases arose. The
highest number of cases brought to our notice in a week was the
week ending January 13th, namely, 298.
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 ithe last quarter. During 1927 and 1928 there was a
fairly high and steady incidence with a peak in October and
N'ovember, 1927. Another wave came during the latter half of
1920 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. In 1931 Chicken Pox was prevalent until the
end of June, when the number of cases declined and remained
low until November, when the cases again rose. During 1932 the
incidence remained steady until the end of March, when a rise
occurred, persisting until the end of August. After the vacation
the disease practically died out for the remainder of the year.
Chicken Pox rose during the first half of 1933 to reach a
maximum early in July. It then dropped rapidly and did not
show any signs of recrudescence until the end of November. In
1934 a moderate wave of incidence covered January to the end of
March, and was followed by a sudden rise during May. The
incidence then dropped, but a small rise was manifest in
December. Chicken Pox showed a minor wave during May, June
and July, and a major wave during November and December, the