[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.

[551.] Definitio 3.

[552.] Experimentum 1.

[553.] Experimentum 2.

[554.] Experimentum 3.

[555.] Experimentum 4.

[556.] Experimentum 5.

[557.] CAPUT XIX. De Radiorum Coloribus & horum immutabilitate.

[558.] Definitio 1.

[559.] Definitio 2.

[560.] Experimentum 1.

[561.] Experimentum 2.

[562.] Experimentum 3.

[563.] Experimentum 4.

[564.] Experimentum 5.

[565.] Experimentum 6.

[566.] Experimentum 7.

[567.] CAPUT XX. De Colorum permixtione, ubi de Albore.

[568.] Experimentum 1.

[569.] Experimentum 2.

[570.] Experimentum 3.