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Bat mainly he limits the scope of his further enquiry on the
subject, to the mortality from small-pox among children under
the age of ten years, for the sufficient reason that the limit
embraces the period within which vaccination has been efficiently
compulsory.
The population of London under ten was 910,784 on census
night, 1881, of whom, in round numbers, 55,000 were unvaccinated,
and 861,000 were vaccinated. In 1881 some 782 smallpox
deaths occurred among the 55,000 unvaccinated, as against
125 among the vaccinated. " Upon equal numbers of the two
classes, therefore, the mortality from small-pox among the
unvaccinated, was about a hundredfold the mortality from
small-pox among the vaccinated. This degree of protection
was given to children under 10, by the average current
vaccination of London."*
" If the London children under 10 who were unvaccinated,
had had the protection which the current vaccination gives, not
782 of them, but at the outside nine would have died of smallpox
during the year.
"If the 861,000 vaccinated children had died at the rate of
the 55,000 unvaccinated, we should not now be considering 125
•"The power of a thorough vaccination to protect against death from
small pox " (it is stated) " is at least ten times greater than the power of
much that passes under the name of vaccination."