f 711 ) _ 
ultimo abrumpens, ideo — a eft ultimus terminus in i/^ayf^yv 
multipUcandus ( per not* 4). Adeoque 
A B D= vy — — I y — a. 
Exemp. 2. Sit 5^*^^ ^^^^ ^^^5 
raa x 211+ t n- 1 ^ 
terminus ultimo abrumpens.eft ^^^^^^^^\^J = 7, und€ 
q— 7 ultimus terminus in y'liTf" multipUcandus ; 
adeoque A BD='^— 7 + V'l^FTTF^ ~ h'^Ti + T 
Et fi capiatur y= V^, erit Area competens huic abfciflfe 
Geometrice Quadrabilis, fcil. Area = ~ ; + ^ ^ 
ya-^^: 
Plura habeo hujufmodi^Theoremata, pro Figuris excirculo 
Parabola & dependentibus 5 fed h^c duo, (peciminis fgratia, 
fufficiant ad oftendendum ufum Methodi meaj in tradiatu 
noftro de Quadraturis edit^e, in determinandis Figurarum ir* 
rationalium Quadraturis, ad quas nulla alia ( quantum fcio) 
Methodus hadenus porrigitur. 
V. Fart of a Letter Mr. Robert Trcdwey, 
to Dr. Leonard Plukenet, Dated Jamai- 
ca, Feb. I a. i^P;* gi'^i^g an Account of 
a great piece of Ambergriefe thrown on that 
IJland ; rvith the Opinion of fame there about 
the way of its froduBion. 
J Shall only at prefent let you know the Account I 
received from Amhergriefe Ben, for fo the Man is 
called from the vaft Quantity of that valuable Commo- 
