( 6o8 ) 
plain A C G E ; - the plain NVhY parallel to ABC D ; and 
the plain LXTQ^ parallel to the plain ABGH. And our firft 
Produ& R r ? Jhall be as the Solid S TWIFZ e b. The Se- 
cond, orr?T will be as the Solid EYZe Q^SMl The 
Third, R?y, as the Solid R HO VF/IS T. And the Fourth, 
R r v, as the Solid Z a b D WXIK. Fifthly, ? Yy, as the So- 
lid G QjlSlMNO. Sixthly, r Yv, as I K L MGY Z A. Se- 
venthly, as the Solid I'KPOBXVfV. And Laftly, 
A1KLM NO ? will be as the Prcdud of the 3 numbers of 
perfons dead, or Yy v. I fhall not apply this in all the cafes 
thereof for brevity fake ; only to fhew in one how all the reft 
may be performed, let it be demanded what is the value of 
the Reverfion of the younger Life after the two eider propofed. 
The proportion is as the whole number of Chances, or Nnv 
to the Produd Ry w, fo is the certain prefent value of the 
Sum payable after any term propofed, to the value due to 
fuch Chances as the younger perfbn has to bury both the el- 
der, by the term propofed ; which therefore he is to pay for. 
Here it is to be noted, that the firft term of all thefe Pro- 
portions is the lame throughout , viz,. Nnv. The Second 
changing yearly according to the Decreale of R 3 r, and En« 
creafe of T,ytv. And the third are fucceffively the prefent 
values of Money payable after one, two, three, &c. years, 
according to the rate of Intereft agreed on. Thefe numbers, 
which are in all cafes of Annuities of neceffary ufe, I have 
put into the following Table, they being the Decimal values 
of One Pound payable after the number of years in the 
Margentj at the rate of 6 per Cent. 
Years 
