[571.] Experimentum 4.

[572.] Experimentum 5.

[573.] Experimentum. 6.

[574.] Experimentum 7.

[575.] CAPUT XXI. De Iride.

[576.] J, R:: CL, CM:: C l, C m:: CL--C l = L l, CM--C m = M n.

[577.] BC, BL:: B b, B o. BC, BM:: B b, B p.

[578.] BL, BM:: J, 2 R.

[579.] Experimentum I.

[580.] BCq, BLq:: 8 Rq, Jq-Rq

[581.] BL, BM:: J, 3R,

[582.] Experimentum 2.

[583.] Experimentum 3.

[584.] CAPUT XXII. De tenuium Laminarum Coloribus.

[585.] Experimentum 1.

[586.] Experimentum 2.

[587.] Experimentum 3.

[588.] Experimentum 4.

[589.] Experimentum 5.

[590.] Definitio

[591.] CAPUT XXIII. De Corporum naturalium Coloribus.

[592.] Experimentum 1.

[593.] Experimentum 2.

[594.] Experimentum 3.

[595.] Experimentum 4.

[596.] Experimentum 5.

[597.] FINIS LIBRI TERTII.

[598.] PHYSICES ELEMENTA MATHEMATICA, EXPERIMENTIS CONFIRMATA. LIBER IV. Pars I. De Mundi Syſtemate. CAPUT I. Idea Generalis Syſtematis Planetarii.

[599.] Definitio I.

[600.] Definitio 3.