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there is no great confluence of flrangers ; or rather 
that a dozen or twenty pariflies, contiguous to one 
another in the country, could be found to keep fuch 
a regiflier j for that would be of more general ufe. 
There have indeed been fome ingenious men who 
have thought, that our London bills are corred: 
enough to form a table from them, which may bet- 
ter agree with our circumftances, than that which 
Dr. Halley has given us. And Mr. Smart was the 
firfl; who endeavoured to do fomething in this way, 
from our bills only, about i 8 years ago. But, in 
the table made by him, he feems to have been greatly 
miftaken j for he has made no allowance for the 
acceflion of ftrangers, but confidered the numbers of 
the dead, in all the periods of life, as all come from 
thofe born here ; whereas it is evident, that the 
ftrangers, above 20 years of age, are at lead: equal to 
them. And this has brought this paradox into his 
table, that young people between 12 and 18, at Lon- 
don, are much more healthy than at Breflau, or in 
any country place in England. For according to 
him, in the 13th year, 2 die only out of 479 j but 
at Breflau there die 6 out of 6345 that is, there is 
double the number die more at Breflau than at Lon- 
don ; which appears impoflible. But between 30 
and 40, he makes them much more unhealthy than 
they are; for at 40 he fuppofes one to die in 29 ; 
whereas there does not die above one in 30, all ages 
taken together, with infants included, as I have 
fbewn in my letter lafl year. Another ingenious 
gentleman, having feen this inconfifbency, has endea- 
voured to corred; it, by fuppofing that the number 
of ftrangers that come to fettle in town, after 25 years 
of 
