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years of age, and 40'7 at fifteen and upwards.
These figures afford additional proof of the fact that
vaccination sometimes fails of its protective power
because of its having been imperfectly performed,
and because it has been weakened by the lapse of
time. But even in spite of this its prophylactic
agency is enormously great. Taking the 1,555 cases
of small-pox which have been the subjects of investigation
in the City, the per centage proportions of
death among the vaccinated and the unvaccinated
at different ages have been as follows:—
So that while the general mortality has been at
the rate of 15.1 per cent. of all who were attacked
with the disease, it has been only 7.5 with the vaccinated,
and as high as 36.8 with the un-vaccinated.
These numbers are not very different from the proportions
which Mr. Marson, in his large experience
at the Small-pox Hospital, has found to be the average
tor the records of the hospital for many years shew