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vaccinated, in which much suffering had certainly been 
inflicted in the name of vaccination, but without true vaccina- 
tion having taken place, while on the other hand greatnumhers 
have most probably been recorded as un vaccinated on whom 
true vaccination had been successfully performed. It is 
evident therefore that the statistics of vaccinated and 
unvaccinated small-pox cases are of very little value for the 
purposes of a scientific investigation, and that the only safe 
conclusions to be drawn from the entire mass of small-pox 
statistics we at present possess are that there has been an 
enormous increase in the mortality from small-pox since 
vaccination was made compulsory, and that this increase is 
still going on rapidly, but at a very much greater rate 
amongst adults than amongst infants and young children. 
Since writing the above my attention has been drawn to 
the paragraphs which have appeared in some of the news- 
papers in reference to a proposal to introduce, in the present 
session of Parliament, a bill for making the revaccination of 
adults compulsory. I have, therefore, now no hesitation in 
submitting to the Society some further results which, I 
think it will be admitted, show more conclusively than 
those given in my paper that a full and impartial inquiry 
into the effects of vaccination is imperatively called for 
before further legislation on the subject takes place. 
As the best test of the value of vaccination, I have dis- 
cussed the small-pox statistics of London — the best vacci- 
nated city in the kingdom — and compared the results for 
the five years 1849-53, before vaccination was made com- 
pulsory, with those for the five years 1869-73, when com- 
pulsory vaccination had been twenty years in operation. 
In the former five years, when vaccination was voluntaiy, 
and the number of vaccinated persons probably did not 
amount to 10 per cent of the total population, the death- 
rate from small-pox in London was *292 ; but in the latter 
