AERIS IN TVBIS. 405 



vnde fundioncs ita definiuntur , vt fit : 



T':S=:;/SdS/1^- ^JXdS et 



A':Sz^USdS/^-{-^jrdS 

 hincquc porro diffcrentiando 



r": S := ■ S /|: - -L /-T fl' S - ^-i^ S T 



A":s-is/^-{-^jrds + ^^sr 



integrando vero reperitur : 



r:S=;S/S^S/|:-'/SS^S/3^-^SS/'T<j'S + ;i..ASST^S 

 A;S-;SrSfl'S/|--;/SS^S/j4f^SS/T^S-^/'SST^S. 



Connriiantur crgo fuper axc ex dato ftatu initiali 

 duae iineae curuae A Q_U et A T F fumcndo ap- 

 plicatas 



SQ^rrS/J: et s r = jr d S -\- '^ s r 



ct fu dionum T et A natura inde ita determitiabitur 

 \t fit 



r":S — iSQ-'STi A":S=r;SQ.-l-LST 

 hincque porro pcr areas 



r^:Sr=;ASQ^-;AST^ A':Srr;ASQ-i-;AST 



tum vero fi liaec forma M : ASQ denf tit eam quan- 

 tit;'tcm quae cxpriniit inte^ralc fdS.A^Q^ habe- 

 bitur : 



r:S=r-|--;M : ASQ^-;M: AST 



A:S=:-{-lM : ASQ_-f ;M : AST. 



E e e 3 His 



