An account of a Bool^y vt\. The Gcometrieal Key , or 
ConJiruBion of all Equations Linear, Quadratic, Cubic 
Biquadratic, by a Circle and one only Parabole 
by iVir.Tho. Baker lector (?/Bifhop Nympcon m Devon- 
Ihire. 
The Analyfis which the ufed for the conftru- 
dling Pr(?^/^mj* geometrically or by lines, has been 
highly advanced by dts Cartes s method i that part of 
this method which concerns local Problems has been, 
well explained by de J^>, butthe other and more prin- 
cipal part of conftrudiing Equations has been lately 
cleared by dela Hire, Yet neither des Cartes notde la 
Hire do it without the trouble of preparing the Equa-- 
by taking away the fecondTerm. To free us of this 
trouble our Author here fhews us to conftrud: all afFeded 
Equations not exceeding the 4th power, by the Inter- 
[ection of a Circle and Parabola without or^iiflion or 
change of any terms. And altho by the Method oi des 
Cartes we may find not only any Parabola^ but alfo 
lipfes^,nd Hyperbola s to con^m^^^^^ic Equations, yet of 
all lines of the firft kind a Circle ^nd. Parabola being the 
mofl: fimple^ it follows that the way which our Author has 
chofenisthebeft. 
In the Book^ ( to render it intelligible even to thofe 
who have read no fomVj*) iht Author ftiews, how a P<^r^- 
bola arifes from the Sed:ion of a Cone, then how to de- 
fcribe it in piano, and from that conftrudlion demon- 
ftrates that the fquares of the Ordinates are one to ano- 
ther as the correfpondent&^/^2^^ or intercepted Diamc'- 
ters s then he Ihews that if a line be infcrib'd in ^Para- 
bola perpendicular to any Diameter, l^c tangle made 
of the Segments of the Infcript, will be equal to a rectangle 
made of the intercepted Diameter and Parameter of 
the Axis. From this laft propriety our ^z^^/j?ar deduces 
the univerlality of his central Rule for the Solution of 
2i\\Biquadratic and cubic Equations, however affected or 
varyed 
