CORPORVM RIGlDOaVM. 225 



In quibiis formulis integnilibiis foLic littcrac niaiiis- 

 culac X, Y ct Z pro \iuiabil.bus habentur , duni 

 contra in forniulis diffcrcntialibus fohie quantitates a 

 temporc t pendentcs tanqiiam variabiles fpcduntur. 



§. 30. Vt nunc irtas formulas rite cuoluamus, 

 pro ternis coordiHatis a*, j, z valorcs contracflos §. 

 22. datos adhibeamus , et quoniam in formulis dif- 

 fcrcntial.bus quaatitatcs X, Y, 2 vt conftantes (pc- 

 ^antur habcbimus 



l^' = ^"A^^ -^ X (V.f) -f- Y i'^;^) -1- 2 (115:') 



Facile autcm intclligitur , fi iftos valores in fupe- 

 rioribus (cx acquationibus fubflitucre veilemus , for- 

 mas maxime diffnfas efFe prodituras , quas tameti 

 operae pretium erit hic adhibuiffe. 



§. 31, Subilituamus crgo adu loco litterarum 

 X, j, z et formularum (^) , r/^ >) gt C^^) valo- 

 res ante euolutos, ct fex aequationes noftrae fequenti 

 modo exprimentur : 



_l_ {q^')fZ d M 



II. /qr=(^^^)/iM4-(^^,f)/X^M+(4f )/Y d M 



_f-(V,-^'j/Z^M 



lII.;R-(^^,^)/^M-+-(^-^«)/X^M-f-('^')/Y^M 



^i.'i^-)fZdm 



Tom.XX.Nou.Comm. Ff IV. 



