bo Mijcellanea Curio [a. 



cUons, has comprehended not only all Cubi- 

 cal, but alfo Biquadratical Equations of every 

 kind, under one General Rule, which he has 

 demonftrated, and abundantly Illuftrated with 

 Examples through all Cafes .5 and moreover 

 at the Clofe, propos'd a way, by which .that 

 General Rule might be InvefLigated. But he 

 does not fhew the very Method, by the help 

 of which (as I fufpecY) he obtain'd his Vni- 

 verfal Geometrical €lavis, or at leaft might have 

 obtain'd it with much more eafe. An<j. fince 

 this Rule of Bakers is no lefs perplex'd with 

 Cautions about the Signs *Jr and — "than Schoo- 

 ten's is, fo that a Perfon can hardly perform 

 |:hofe Conftrudtions aright, without he has the 

 Book by him *, I thought that it wou'd not be 

 either Unpleafant or Unprofitable to young 

 Students, to explain the Foundations of both 

 Rules, and by fome emendation of the Me- 

 thod once more, to afford as much light as I 

 cou'd in fo difficult a Matter. Canefmss Con- 

 firmation (which does very eafily difcoverthe 

 Roots of all Cubick or Biquadratick Equati- 

 ons, where the fecond Term is. wanting) may 

 be fuppos'd as known. Yet fince 'tis the main 

 bottom, on which all that follows does de- 

 pend that this Diflertation may not feem tq 

 want a principal Part, Fll here add the Rule 

 taken out of his Geometry, altering fome few 

 things fas I think) for the better. 



The fecond Term being out of the Equati- 

 on; all cubical Equations, are reduced to 

 this Form, z, 3 %. apz.. aaqtz 0 - 0 3nd Biquadra^ 

 tical ones to this Form, z+. apzx.. akfsss. 

 a^r t=io, where a denotes the Latus Retlum of 

 any given Parabola, which is ufed in the 



Con- 



