l<)% MifceUanea Curiofa. 



will not be neceflary to compute for every Year 

 fingly ; but that in moft Cafes every 4th or 5th 

 Year may fuffice, interpoling for the intermedi- 

 ate Years feeundum artem. 



It may be objected, that the different Salu- 

 brity o{ Places does hinder this Propolal from 

 being unlver/al ; nor can it be denied. But by 

 the Number that die, being 11 74. fer Annum 

 in 34000, it does appear that about a 30th 

 part die yearly, as Sir Wslliam Petty has com- 

 puted for London \ and the Number that die in 

 Infancy, is a good Argument that the Air is but 

 indifferently falubrious. So that by what I can 

 learn, there cannot perhaps be one better Place 

 propoled for a Standard. At leaft 'tis defired, 

 that in Imitation hereof the Curious in other 

 Cities would attempt fbmething of the (ame Na- 

 ture, than which nothing perhaps can be more 

 ufeful. 



Were this Calculus founded on the Experience 

 of a very great number of Years, it would be ve- 

 ry well worth the while to think of Methods for 

 facilitating the Computation of the Value of 

 two, three, or more Lives • which, as propofed 

 in my former, feems (as 1 am inform'd) a Work 

 of too much Difficulty for the ordinary Arithme- 

 tician to undertake. 



I have fought, If it were poffible, to find a 

 Theorem that might be more concife than 

 the Rules there laid down, but in vain ; for 

 all that can be done to expedite it, is, by Ta- 

 bles of Logarithms ready computed, to exhibt 

 the \Atioms of N to T in each fingle Life, 

 for every third, fourth, or fifth Year of Age, 

 as occafion fhall require ; and thefe Loga- 

 rithms being added to the Logarithms of the 



