[51.] PROPOSITIO XXIV.

[52.] PROPOSITIO XXV.

[53.] PROPOSITIO XXVI.

[54.] SCHOLIVM I.

[55.] SCHOLIVM II.

[56.] SCHOLIVM III.

[57.] PROPOSITIO XXVII.

[58.] ALITER.

[59.] PROPOSITIO XXVIII.

[60.] SCHOLIVMI.

[61.] SCHOLIVM II.

[62.] PROPOSITIO XXIX.

[63.] SCHOLIV M.

[64.] PROPOSITIO XXX.

[65.] SCHOLIVM I.

[66.] SCHOLIVM II.

[67.] PROPOSITIO XXXI. Semifuſi parabolici cuiuſcunque, centrum grauitatis reperire.

[68.] SCHOLIVM.

[69.] PROPOSITIO XXXII.

[70.] SCHOLIV M.

[71.] PROPOSITIO XXXIII.

[72.] SCHOLIVM.

[73.] PROPOSITIO XXXIV.

[74.] SCHOLIVM.

[75.] PROPOSITIO XXXV.

[76.] SCHOLIVM.

[77.] PROPOSITIO XXXVI.

[78.] SCHOLIVM.

[79.] PROPOSITIO XXXVII.

[80.] SCHOLIVM.