I oo Mtjcellanea Curiofa. 



Axis in E. From E fet off EF w i />, down- 

 wards, if it be — • f in the Equation, but up- 

 wards towards A if it be -[-p ? then at the 

 point F(or £, if p be wanting) ereft the Per- 

 pendicular F G, meeting the Line B C in (7, 

 and in G F produced take GHcs^, to the 

 Right Hand, if it be-*^ in the Equation, 

 but to the Left, if-]- q. Then will the point 

 H be the Center, and HD the Radius of the 

 Circle fought, which (letting fall Perpendi* 

 culars to the Axis from its Interfe&ions with 

 the Parabola) will fliew all the Roots (as 

 L M) of the Equation. And how this Con- 

 ftru&ion follows from what went before, is 

 evident enough of it felf, fo that there is no 

 need of inlifting any farther upon the De- 

 monftration of it. 



a mf 



