[471.] Experimentum 3.

[472.] CAPUT VI. De Luminis Refractione & hujus legibus. Definitio 1.

[473.] Definitio 2.

[474.] Definitio 3.

[475.] Definitio 4.

[476.] Definitio 5.

[477.] Definitio 6.

[478.] Experimentum 1.

[479.] Experimentum 2.

[480.] Experimentum 3.

[481.] Definitio 7.

[482.] Experimentum 4.

[483.] CAPUT VII. De luminis refractione, quando media ſuperficie planâ ſeparantur. Definitio i.

[484.] Definitio 2.

[485.] Definitio 3.

[486.] Definitiones 4. & 5.

[487.] Definitio 6.

[488.] Definitio 7.

[489.] Experimentum 1.

[490.] Experimentum 2.

[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.