FORMVL. DIFFERENTIALIVM. ipi 



dV^ dd^ __ d' R^ 



" ^^^ "+■ ^^y^ "" Vji-V/^ 

 </F d_d^ ifJJi 



''dd(^^ ! 



Kro qiia aequatlone obreruetur omnla membra in 

 iisdem lineis iiorizontalibus difpofita euanefcere , de- 

 inde fi fcribendi ratio inuertatur adeo vt omnia 

 membra pro ratione ipfius z ordinentur , hoc eft ii 

 habeatur ; 



dV^ d^^ /R^^"i 



- i^^ ) ■+■ (^^^^ ) - (^^"5) 



^ ^^Q^^ d' R^ 



dJQ^ d'R" 

 ^'^dx ^"^dxd^ 





adhac 



