[91.] De Centri gravitatis inveſtigatione.

[92.] SCHOLIUM 2. Arithmetica Mechanica.

[93.] CAPUT X. De Vecte, Machinarum ſimplicium prima. Definitio 1.

[94.] Experimentum 1. 2. & 3.

[95.] Experimentum 4.

[96.] Experimentum 5.

[97.] Experimentum 6.

[98.] Experimentum 7. & 8.

[99.] Experimentum 9

[100.] CAPUT XI.

[101.] Definitio

[102.] Experimentum 1.

[103.] Experimentum 2.

[104.] CAPUT XII. De Trochlea, Machinarum ſimplicium tertia.

[105.] Experimentum 1.

[106.] Experimentum 2.

[107.] Experimentum 3. & 4

[108.] Experimentum 5.

[109.] CAPUT XIII. De Cuneo & Cocbleâ, Machinarum Simplicium quartâ, & quintâ.

[110.] Definitio I.

[111.] Definitio 2.

[112.] Definitio 3.

[113.] Definitio 4.

[114.] Machina Qua cunei affectiones demonſtrantur.

[115.] Experimentum

[116.] Definitio 5.

[117.] SCHOLIUM I. De ligno findendo.

[118.] SCHOLIUM 2. Machinæ cujuſdam examen.

[119.] CAPUT XIV. De Machinis compoſitis.

[120.] Experimentum I.