P — a'',^ fin. s-^-aT coC.S' 

 Q :rr - a j J cof. j H- r>: T fin. s \ 



i T 



quo crcn cafii omncs trcs vires perfecte determinantiir; 

 •vnde fi tenfio vbidiic dcbeat efiTc cnnftans fine T=:L), nos- 

 trae vircs criint P rr a D cof s\ Q — a D cof. s\ R — o , 

 atqiie hinc manifeflunn cft qiiemadmodiim omncs huiusmo- 

 di quaertiones tracflari conucniat. 



Dc acquilibrio filoriim clafticorum a viiibus 

 quibuscuuque Ibllicitatorum. 



§. 29. Formulae generalcs pro filis cKiRicis d<itae 

 multo commodiorcs rcddcntur introdnclionc litterarum p, 

 <7 > r, quaium valores erant pofici 



dzddy — dy d i z , dxdd z — izddx. „ dy ddx — ixddy. 



H — dT» » H - dT^ 1 ^ — d sJ » 



circa quas formulas iam fupra notauimus fore p d x -\- 



q d y -\- r d z — o, Praeterea vero quoque euidcns eft 



ioxQ p dd X -\- q d dy -\- rd d z — o:, vnOe ex differentiatio- 



ne prinris aequalitatis oritur dp dx-\- dqdy -\- dr dz — o ^ 



id quod etiam iiuk p^uct , quod fumto clemcnto ds con- 



flante fit 



d s5 J 



d X d' z — dzd^ ». 



// »■ — d ■)/ d^ X — d X d- y . 



d q — 



hnc autem infuper fequitur fnre 



Has i^itur infignes rciationcs inter quantitatcs /), ^, r pro- 

 be notafle iuuabit. 



X 3 §. 30. 



