hypothecs, is nearer to that by the London, than tb 
that by the Breflaw obfervations. 
However, if the argument for ufing the London 
obfervations has any force at all, the' computation of 
the value of each perfon s life muft be made from 
obfervations, drawn from the bills of moitality, kept 
at the pkee of his or her reiidence : and therefore it 
is, that I at prefent trouble yon, in order to contri- 
bute, as much as 1 can, to there being a fufficient 
number of good bills of mortality. 
There feems to be an objection, both to the hypo- 
thefis, and to the obfervations ; for it is well known, 
that the fair fex (efpccially at two periods of their 
life) are obnoxious to fatal diforders, not incident to 
the other fex, nor diftinguifhed in the prefent bills 
of mortality ; and, confequently, neither the tables 
of obfervations, nor the hypothecs (which is derived 
from them) will render the calculations of the values 
of lives fufficiently certain j unlefs there be a peri- 
odical diftinCtion of fexes in thofe bills : as it would 
probably appear, if fuch a diftinCtion had been in- 
troduced, that there is a wide difference between 
the values of a male and female life of the fame as:e. 
But there will be a great inconvenience, in reject- 
ing the hypothecs, which none of thefe gentlemen 
have remedied ; I mean the prolix and laborious 
computation hitherto directed for the finding the 
values of lives from tables of obfervations : whereas, 
by the hypothelis (as its author juftly obferves) more 
can be concluded in a quarter of an hour, than can 
be performed in a quarter of a year, by any method, 
which the others have demonftrated. Whence it 
may be prefumed, that the hypothelis will continue 
2 tO 
