ip$ fOrmvlae pro trakslatione 



da qiiaccunquc pcrpetuo candcm cuantitatem feri^are 

 dcbent. 



§. 17. lam vcro difbntiae punclorum 2 et Z' 

 in ftatu initiali quadratum cft 



(/>'-;'r-H(9'-^)'-H(/'-r)' 



in Hatu amem tran^lato qundratum d'ftantiae inter 

 pundla z ec z' tit 



quod er^o ex tribus fcqucntibus quadrntis compo- 

 nitur 



H-(H(i.'-/))-+-H'(9'-ry)+H"C;'-r))' 

 quorum crgo lumma aequalis efle debet illi formulae 



(^/_p;^-(,/_^y + (,'-0'- 



§. 18. Euolutis nutcm tcrnis illis quadratis 

 fcqucns exprcfl'10 refultabit 

 i (/)'-/) )'(FF^-GG^-HH) 



.(<7/_^y(y:'F/_^G'G'-HH'H') 

 (,./_^)^(F"F"+G"G"-i-H"H") 

 .o(p/_p)(9/_^}(FF'-+-GG'-i-HH') 

 „(^/_p)(;/^;)(FF"H-GG"-t-HH") 

 „(^/_^)(r/_,-)(F'F"-f-G'G"-f-Il'H") 

 quamcbrem , \t ifta exprcflio priori 

 ip'-p)'^{cj'-qy-hir'-ry 

 rcddaiur acqualis , quomodccunque coordinatae />, q, 



r, 



