C 177 ] 
tioned above, this will deftroy the whole hypothefis, 
upon which the table is formed. 
If WQ fuppofe that one in 54 die at Breflau in 
the year, as appears from Dr. Halley’s table, and one 
in 30 at London, this difference does not fhew, that 
the probabilities of life in both places are not the 
fame above 20 years of age ; for it may be fully ac- 
counted for, from the different probabilities under 
the age of 4. Becaufe every year, at London, there 
dies one- fourth of the infants, under 4 years of age, 
more than at Breflau ; which, without confidering-^ 
the other differences that may be between that age 
and 1 5", will more than account for the difference I 
have mentioned. At London the proportion of one 
in 30, comprehends all, as well flrangers as natives; 
but at Breflau the proportion of one to 34 is only to 
be underftood of thofe that are born there. Mr. 
Smart, in his table, has made the proportion among 
thofe that are born at London to be one to 24, and in 
his table corrected it is made as one to 19 ; but in 
the table that I have conftrudted from the Breflau 
and London together, it is one to 21,5 ; which is a 
medium between them. 
If it be faid, that from our bills the infant flate, 
under the fifth year, certainly appears more un- 
healthy than at Breflau, and therefore probably it is 
fo in advanced life : It may be anfwered, that pofii- 
bly our grofs air may not fuit fo well with infants, 
and yet may agree well enough with them after they 
become Itronger ; as we fee fome forts of food are 
improper for the infant flate, and yet do very well 
when nature comes to maturity. And it may likewife 
be alleged, that perhaps we are in a bad way of 
VoL. 49. A a managing 
