[491.] CAPUT VIII. De refractione luminis, poſitis mediis ſuperficie ſphæricâ ſeparatis.

[492.] Experimentum 1.

[493.] Experimentum 2.

[494.] Experimentum 3.

[495.] Experimentum 4.

[496.] Experimentum 5.

[497.] Experimentum 6.

[498.] Experimentum. 7.

[499.] Experimentum 8.

[500.] Experimentum 9.

[501.] CAPUT IX. De Motu Luminis trans Medium denſius. Vbi de Lentium affectionibus.

[502.] Definitio i.

[503.] Definitio 2.

[504.] Experimentum i.

[505.] Experimentum 2.

[506.] Experimentum 3.

[507.] Experimentum 4.

[508.] CAPUT X. De Viſu, ubi de Oculi conſtructione.

[509.] Definitio.

[510.] Experimentum i.

[511.] Experimentum 2.

[512.] Experimentum 3.

[513.] CAPUT XI. De viſione trans vitra, & corrigendis quibuſdam oculorum vitiis.

[514.] De Microſcopiis & Teleſcopiis.

[515.] Definitio 1.

[516.] Definitio 2.

[517.] Experimentum 1.

[518.] Experimentum 2.

[519.] Definitio 3. & 4.

[520.] Definitio 3.