aSo DE PRINCIPIIS 



Or'Ox-dx-{-dtdx[^^^, rp-xyzzdtdx{^j,pl-yz-dtdx[p^) 



erit zl-Vidx^-^-^dtdx^i^y^^ziidx+dtdxi^^) , quia 

 particulas poft fignum radicale , vbi differentialia 

 ad quatuor dimenfiones aifurgunt , reiicere licet , 

 fimili modo erit 



zm — dy+dtdyip^) et zn—dz^dtdz{%) 



deinde pro latere Im ob 



Or-Os-dx^dtdx{iJL)^dtdy[yL) 



sq--rp-dj-'dtdx{^-)^dtdj{l^^-.' 



qm--pl--dtdx{'^)^dtdy{'^) 



fiet imzny^dx^-i-dy-hzdtd x' { ^^)-^idtdxdj\ |)- 2 dtdxdy{^) 



^ldtdy^{'^')^ 



, dtdx\^^)-dtdxdy{^)--dtdxd){^)-\dtdyY^) 



feu Jm - y(dx'+ dy')A -^-^ —-"^-^ ^^ — -^ 



^ ^ ^^ 'Vidx^-+-df-) 



Hinc autem commodiiis angulus Izm definitur, cum 

 enim fit cof. /g??? — ^^^'^''f '""'""' reperitur 



2.dtdxdY{i^-^)'{-{t-)) 



cof. Izm r r^.^illi^^'— dt{p)-\-dt(^) 



zdxdy ^^^^ «^^ 



qui ergo angulus infinite parum a redo dilcrepat, 

 fimili autem modo inuenitur 



coi:.Izfi-dt{^-^)'\-dt{p')Gtcoi:.mzn-dt{p)i-dt{p') 



ynde patet finus horum angulorum ta.m prope ad 

 finum totum accedere, \t de-eftus formulis differen- 

 tialibus fecundi gradus exprimatur. Scho- 



