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7
scars result from the vaccination it is advisible for the re-vaccination
to be done during the seventh year of life, and again
about sixteen years of age.
The good effects of vaccination, even although it is iu very
many eases imperfectly performed, is well shewn by the statistics
of the Small Pox Hospitals, Homierton. During the year 1871
there were 3149 admissions, of which 59.2 per cent. were vaccinated,
so that if the mortality of the vaccinated and nonvaccinated
had been relatively alike there would have been 59.2
per cent. of all the deaths amongst the vaccinated and only 40.8
amongst the non-vaccinated. The returns made to the Registrar
of Hackney Sub-District (from which I have extracted them)
shew that 61.6 per cent. of all the deaths happened amongst
the 40.8 per cent. non-vaccinated, and 38.4 per cent, amongst
the 59.2 per cent. which were vaccinated.
These returns are, however, not nearly so favourable to
vaccinatiou as the statistics compiled by Mr. Marson at the
Holloway Hospital. This perhaps may be caused by my having
entered amongst the vaccinated all those in which the words
"non-vaccinated" was not entered against the death. Mr.
Marson states in his report, that whilst the average mortality of
all admitted is about 15 per cent., that amongst the unvaccinated
it is about 37 per cent., that when vaccination has been properly
performed the rate of death is only about 2.5 per cent., and when
badly done, about 8.8 per cent,, and that it varies according to
the number of good marks on the arm. When there were four
marks the mortality was only 0.6 per cent.; where there were
three, it was 1.9 per cent.; where two, it was 4.7 per cent; and
where only one, 7.7 per cent. In cases where it was said that
vaccination had been done in childhood, but there was not any
mark, the mortality was ns high as 23.6 per cent. Dr. Monk