[61.] PROPOSITIO VI.
[62.] PROPOSITIO VII.
[63.] PROPOSITIO VIII.
[64.] PROPOSITIO IX.
[65.] Conoidis parabolici ſuperficiei curvæ circulum æqualem invenire.
[66.] Sphæroidis oblongi ſuperſiciei circulum æqualem invenire.
[67.] Sphæroidis lati ſive compreſſi ſuperficiei circulum æqualem invenire.
[68.] Conoidis hyperbolici ſuperficiei curvæ circulum æqualem invenire.
[69.] Curvæ parabolicæ æqualem rectam lineam invenire.
[70.] PROPOSITIO X.
[71.] PROPOSITIO XI.
[72.] HOROLOGII OSCILLATORII PARS QUARTA. De centro Oſcillationis.
[73.] DEFINITIONES.
[74.] I.
[75.] II.
[76.] III.
[77.] IV.
[78.] V.
[79.] VI.
[80.] VII.
[81.] VIII.
[82.] IX.
[83.] X.
[84.] XI.
[85.] XII.
[86.] XIII.
[87.] HYPOTHESES. I.
[88.] II.
[89.] PROPOSITIO I.
[90.] PROPOSITIO II.