[521.] Experimentum 3.

[522.] Experimentum 4.

[523.] CAPUT XIII. De Reflexione Luminis.

[524.] Definitio 1.

[525.] Definitio 2.

[526.] Experimentum 1.

[527.] Experimentum. 2.

[528.] Experimentum 3.

[529.] Experimentum 4.

[530.] CAPUT XIV. De Speculis planis.

[531.] CAPUT XV. De Speculis ſphæricis.

[532.] Experimentum 1.

[533.] Experimentum 2.

[534.] Experimentum 3.

[535.] Accedente autem ad ſpeculum corpore lucido, recedit ap-parentia , quæ in eo caſu major eſt.

[536.] Experimentum 4.

[537.] Experimentum 5.

[538.] CAPUT XVI. De Lucerna Magica.

[539.] LIBRI III. Pars III. De Opaco & Coloribus. CAPUT XVII. De Corporum Opacitate Definitio.

[540.] Experimentum. 1.

[541.] Experimentum 2.

[542.] Experimentum 3.

[543.] Experimentum 4.

[544.] Experimentum 5.

[545.] Experimentum 6.

[546.] Experimentum 7.

[547.] Experimentum 8.

[548.] CAPUT XVIII. De diverſâ radiorum ſolarium refrangibilitate.

[549.] Definitio 1.

[550.] Definitio 2.