1 6 4. MiJceUanea Curio fa . 



CD 



of Defcent thro' BC, is the Time of 



VQD 



Defcent thro' CD (by Prof. 54. fag. 158. 

 Newt.) Therefore the point C ought to be 



BC CD 



fuch that • |- may be a Minimum. 



VLC VQP 



Suppofmg the points B and D to be fix'd, 

 let the conftant Quantities GC^DEcw, 

 LC es b, QD =/? ; the Indeterminate Quantities 

 BG=^ CE ~£ whence 



Vw* + * a '+Viw a, + ** = a Mi- 



<Jb VP 

 tytnum. Therefore 



udu z.dz, 

 - — + = 



But du dz, (becaufe i> +* s. is conftant) 

 therefore 



— . e — — — • whence 'tis 



manifeft that a a conftant 



Quantity. Now let the Abfdfle AL « ml 

 the Ordinate LCs;, and to BG ~dx, 



GC 



