[ 231 ] 



\ 



equation "*"-^. . — i =o are + e ;-y^ — e* will be always a di- 



vifor of — — I or ^ + .y' — i. Whence in every cafe we may 



proceed as above and fhall always have the equation of the • orbit 

 in a feries of fines of multiple arcs converging by the powerSr 

 of the excentricity. 



F f 2 



