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As the Municipal Foot Clinic was established only as recently as
March, 1936, the number of cases dealt with is relatively small.
Although there is no apparent special seasonal incidence in the
case of adults, it will be seen that in the case of children there was
a marked increase in the number of cases who first attended for
treatment during the months of October, 1936 ; January, 1937;
and November, 1937.
Incubation Period. The generally accepted view is that the
period of incubation is from four to six weeks. At first the condition
is regarded as a corn, and it is only when it spreads and
does not yield to " corn paint " and home treatment that advice
is sought—usually from two to four months after infection.
Indications foe Investigation.
If there had occurred a marked increase in the incidence of
plantar warts among school children during the autumn and early
winter months, the occurrence might have been accepted as being
attributable to the abnormal irritation, injury and exposure to
infection of the soles of the feet during the summer vacation when
so many children run about either bare-footed or wearing cheap
rubber shoes with thin soles ; but the outbreak occurred in the
month of April, at a time when the usually accepted causative