^^6 Opuscula, 
formulam voco (C). Si sequationis (B) difFerentias fumas, 
erit W c d y — w ^ ^ -f. « ^ ^ H- N' c ^ y — M^"^"^ 
,2fdt-^iydy: vero hujus primum membrum fubllituas 
in (C) pro M' n- N' . 2 ^ ^z- -f- 2jy ^ y , illa fict 1 m d t 
2 c dy — M' md t-{-U.\ dy — 2 ]A'}id t -\- ]<\' n d t — 2 N'cdy 
-^N' c dy — m dt — M' c dy — n d t — W c dy — 0 y Ci- 
j M' m — N'« I /-iM'w — N'w ^ J ^ 
ve dt . — — , ^,— — f ; fed — rr- T-xr- = — > ^i^go — sde 
M + N M + N " 
— cdy. Ut alterurram aut jy ejicias, iterum in ufum re- 
voca xquationcm ciiculi t^ — ts — c y — y^ t five — c y 
H_ — =z / X — -+---,& y ^ =rv/ti — ^ • ergo // « 
4 4 i 4 
— r t dt - . , .. , 
= — . — : led — s d t =z c dy : Jgitur --^ s d t 
Wst~tt + '^ 
4 
9 . s dt — dt — 
- ; ejedoque d t ^ — s ,i ,\/ s t—tt-\-— =: e s 
4 
2 c t^ &x*.4x^ — ^tt-{-ccz=zc^s'^ — /^c^ st -H ^c^ t^ , fivt 
^s^ t — 4 /- — 4 — 4 X ^ , ex qua primo t —o , deinde 
s^-^sc^ —s^-t-^-tc"- ^ five '-—^ z= / 1= y = CV . Verum 
i — 0 dux refpondent ordinatae altera — C D — <r , altera 
— ; & duae pariter t — s^ altera V R — r , aitera — 0 : 
quatuor ergo , qux jam novimus punda , nempe C , D , R , V 
poflunt qu^fitum minimum fufficere . Antequam tamen ali- 
quid certi hac in re ilatuamus , obfervandum nobis elt di- 
ligenter, quid novi accidat, fi formulas (A) , & (C) ponamus 
xquaies inimito : id enim ornnino ell faciendum , ut maxi- 
ma omnia, vei niinima tuto detegamus . Hoc autem quam- 
vis in idibus dire6lis poific omitti , propterea quia nihii in- 
de conlcquitur abl^Drdi, pr etermittendum tamen non erat 
Maupcituiiio 5 qui univerfaiem quemdam modum, ac rario- 
nem de fui principn ufu in motus communicatione traden- 
dam propoluerat . Itaque fi (A) primum, deinde (C) , ex 
q'ua ope cai.. ;jii fuperioris ejedi fitjy, sequemus infinito ; 
piima, qLiia caret ciivf^ e, nuiii maximo , aut minimo in- 
^ c s dt — -LCt dt 
veniencLO apta cit , ex altera fit — ~~^sd t — 00 ^ 
z\/ st ~tt-b ~ 
five 
