(70) = 



(w-f-i) (i— 3/ 4r«-4-i) 



j 3 



3 (i -+- M/ 3^1-+-/ // 



3 

 ( i -h 1 1/ 



j = ; (3 — (« -+- 2) ' 0- 



(l-^tt/ 



Diiiidatur poftcrior acquatio per priorem ct prodibit 



'"^''■> = («-f-2)/'— 3^, 



X 



Hinc niitcm fatis liquct, fi vcllcmus quantitatcm t cli- 

 minare , acquationcm intcr .v et j ad plurinias din cnfiones 

 efle adfccnfuram. Sufficiat igitur tres fornnilas gcncralcs exhi- 

 buiffe , quarum fiugulac innumerabilcs curuas aigcbraicas fup- 

 pcditarc pofTunt , ita vt in omnibus longitudo arcus curuac 

 // (c) .V* -+- dj') , acquctur arcui parabolico : /d v ]/ (i -+- v 1'). 



DE 



