C =;32 ) 



nes, etaxescoordinatarum, «, «''cact. , /3,j8' 

 caer. , y , y' caet. , erit: • 



^^ = C? zz Cp. cof. pCY^p cof.tt; 

 OE=:^=:.r— /> cof. a ; 

 fic, 



^ — T'' P cof. f3\ c ^ z — p cof: y ; - 

 ec eodem modo.de reliquis. 



SubHituamu* igitur hos valores in praeceden- 

 tibus , eritque : 



_ '^i2 y^ z pcof, fi ^ zy +y pcof.y') 



id cst, r. 



L = P (jy r<)/. y — 2 r(?/. /5) 

 -: + P'C3'' f^/.-.r' - z' cof /3')+ caet. (/3), 

 ct eodcm modo inveniuntur: 



JM = P (2 cof. X — X cof. 7) 

 c ;'^;;P;C-' cof »' - x'. cof r') +c?.et.(y), 

 N = P (x cof. P - y cof «) 

 + ?'Cx' cof (S'-' y' cof «') +caet. 

 Quoniam in aequatione gcnerali C*) ? difFeren- 

 tialcs dcp, rftp, //«, a fe invicera non pen- 

 derit , ratisfacimusiilli aequationi, ponendo : 



L = o,M=ro,N=:o (S). 



Ergo acquilibrii conditiones et compofitio- 

 nis regulae comtincntur aequationibus (0), 



Cr) 



